यदि \(A={x:x\) एक अभाज्य संख्या है और (10<x<30}) है, तो (A) का रोस्टर रूप कौन सा है?
If \(A={x:x\) is a prime number and (10<x<30}), which is the roster form of (A)?
#sets
#roster-form
#set-builder
#prime-numbers
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A \(A=\{11,13,17,19,23,29\}\)
B \(A=\{11,13,17,19,21,23,29\}\)
C \(A=\{13,17,19,23,29,31\}\)
D \(A=\{10,11,13,17,19,23,29,30\}\)
Explanation opens after your attempt
Correct Answer
A. \(A=\{11,13,17,19,23,29\}\)
Step 1
Concept
दी गई शर्त में (10) से बड़ी और (30) से छोटी अभाज्य संख्याएँ चाहिए। / The condition asks for prime numbers greater than (10) and less than (30).
Step 2
Why this answer is correct
ऐसी संख्याएँ (11,13,17,19,23,29) हैं, इसलिए रोस्टर रूप यही होगा। / These numbers are (11,13,17,19,23,29), so this is the roster form.
Step 3
Exam Tip
परीक्षा में सीमा वाली संख्याओं को तभी शामिल करें जब असमानता में बराबर का चिह्न हो। / In exams, include boundary numbers only when equality is given.
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निम्न में से कौन सा वर्णन सुव्यक्त समुच्चय बनाता है?
Which of the following descriptions forms a well-defined set?
#sets
#well-defined-set
#set-representation
#conceptual-mcq
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A (10) से छोटी विषम प्राकृतिक संख्याएँ / Odd natural numbers less than (10)
B कक्षा के अच्छे विद्यार्थी / Good students of a class
C सुंदर चित्र / Beautiful pictures
D रोचक अध्याय / Interesting chapters
Explanation opens after your attempt
Correct Answer
A. (10) से छोटी विषम प्राकृतिक संख्याएँ / Odd natural numbers less than (10)
Step 1
Concept
सुव्यक्त समुच्चय में यह साफ तय होना चाहिए कि कोई वस्तु उसमें आती है या नहीं। / In a well-defined set, it must be clear whether an object belongs to it or not.
Step 2
Why this answer is correct
(10) से छोटी विषम प्राकृतिक संख्याएँ निश्चित रूप से (1,3,5,7,9) हैं, इसलिए यह सुव्यक्त है। / Odd natural numbers less than (10) are exactly (1,3,5,7,9), so this description is well-defined.
Step 3
Exam Tip
परीक्षा में सुंदर, अच्छा, रोचक जैसे शब्दों से बने वर्णन आम तौर पर सुव्यक्त नहीं माने जाते। / In exams, words like beautiful, good, and interesting usually make a description not well-defined.
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समुच्चय \(B={2,4,6,8,\ldots,40}\) को समुच्चय-निर्माण रूप में सही तरह से कैसे लिखा जाएगा?
How should the set \(B={2,4,6,8,\ldots,40}\) be correctly written in set-builder form?
#sets
#set-builder
#even-numbers
#roster-form
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A \(B={x:x=2n,\ n\in N,\ 1\le n\le 20}\)
B \(B={x:x=2n,\ n\in N,\ 1<n<20}\)
C \(B={x:x=n^2,\ n\in N,\ 1\le n\le 20}\)
D \(B={x:x=2n+1,\ n\in N,\ 1\le n\le 20}\)
Explanation opens after your attempt
Correct Answer
A. \(B={x:x=2n,\ n\in N,\ 1\le n\le 20}\)
Step 1
Concept
दिए गए समुच्चय में (2) से (40) तक सभी सम धन पूर्णांक हैं। / The set contains all positive even integers from (2) to (40).
Step 2
Why this answer is correct
हर पद (2n) के रूप में है, जहाँ (n=1) से (20) तक जाता है। / Each element is of the form (2n), where (n) runs from (1) to (20).
Step 3
Exam Tip
रोस्टर से निर्माण रूप बनाते समय अंतिम पद की जाँच अवश्य करें। / When converting roster form to set-builder form, always check the last element.
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यदि \(A={x:x\in Z,\ x^2-4x+3=0}\) है, तो (A) का सही रोस्टर रूप कौन सा है?
If \(A={x:x\in Z,\ x^2-4x+3=0}\), which is the correct roster form of (A)?
#sets
#set-builder-form
#roster-form
#quadratic-condition
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A \(A=\{1,3\}\)
B \(A=\{-1,-3\}\)
C \(A=\{0,1,3\}\)
D \(A=\{2,3\}\)
Explanation opens after your attempt
Correct Answer
A. \(A=\{1,3\}\)
Step 1
Concept
\(x^2-4x+3=0\) को ((x-1)(x-3)=0) लिखा जा सकता है। / \(x^2-4x+3=0\) can be written as ((x-1)(x-3)=0).
Step 2
Why this answer is correct
इससे (x=1) या (x=3) मिलता है, और दोनों पूर्णांक हैं। / This gives (x=1) or (x=3), and both are integers.
Step 3
Exam Tip
समुच्चय-निर्माण रूप से रोस्टर रूप बनाते समय पहले शर्त का हल निकालें, फिर दिए गए संख्या-समुच्चय से मिलाएँ। / When converting set-builder form to roster form, solve the condition first and then match it with the given number set.
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यदि \(C={x:x^2=16,\ x\in Z}\) है, तो (C) में कितने अवयव हैं?
If \(C={x:x^2=16,\ x\in Z}\), how many elements are there in (C)?
#sets
#set-builder
#integers
#cardinality
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A (1)
B (2)
C (4)
D (16)
Explanation opens after your attempt
Step 1
Concept
\(x^2=16\) के पूर्णांक हल (x=4) और (x=-4) हैं। / The integer solutions of \(x^2=16\) are (x=4) and (x=-4).
Step 2
Why this answer is correct
इसलिए समुच्चय \(C=\{-4,4\}\) है और इसमें दो अवयव हैं। / Therefore \(C=\{-4,4\}\), so it has two elements.
Step 3
Exam Tip
वर्ग समीकरण में धन और ऋण दोनों मान जाँचना न भूलें। / In square equations, remember to check both positive and negative values.
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समुच्चय \(B=\{0,3,8,15,24\}\) को समुच्चय-निर्माण रूप में सही तरह से कैसे लिखा जा सकता है?
How can the set \(B=\{0,3,8,15,24\}\) be correctly written in set-builder form?
#sets
#set-builder-form
#pattern-based-set
#roster-form
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A \(B={x:x=n^2-1,\ n\in N,\ 1\le n\le 5}\)
B \(B={x:x=n^2+1,\ n\in N,\ 1\le n\le 5}\)
C \(B={x:x=3n,\ n\in W,\ 0\le n\le 4}\)
D \(B={x:x=2n+1,\ n\in W,\ 0\le n\le 4}\)
Explanation opens after your attempt
Correct Answer
A. \(B={x:x=n^2-1,\ n\in N,\ 1\le n\le 5}\)
Step 1
Concept
दिए गए अवयवों को क्रम से देखें: (0,3,8,15,24)। / Look at the elements in order: (0,3,8,15,24).
Step 2
Why this answer is correct
ये \(1^2-1,2^2-1,3^2-1,4^2-1,5^2-1\) से बनते हैं, इसलिए \(x=n^2-1\) सही नियम है। / They are formed by \(1^2-1,2^2-1,3^2-1,4^2-1,5^2-1\), so \(x=n^2-1\) is the correct rule.
Step 3
Exam Tip
पैटर्न वाले प्रश्नों में पहले दो-तीन पदों पर नियम जाँचें, फिर अंतिम पद पर भी जाँच कर लें। / In pattern-based questions, test the rule on the first few terms and also on the last term.
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समुच्चय \(D={x:x\) (12) का धन भाजक है(}) का सही रोस्टर रूप कौन सा है?
Which is the correct roster form of the set \(D={x:x\) is a positive divisor of (12})?
#sets
#divisors
#roster-form
#set-builder
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A \(D=\{1,2,3,4,6,12\}\)
B \(D=\{2,3,4,6\}\)
C \(D=\{1,2,4,6,8,12\}\)
D \(D=\{0,1,2,3,4,6,12\}\)
Explanation opens after your attempt
Correct Answer
A. \(D=\{1,2,3,4,6,12\}\)
Step 1
Concept
धन भाजक वे संख्याएँ हैं जिनसे (12) पूर्ण रूप से विभाजित होता है। / Positive divisors are numbers that divide (12) exactly.
Step 2
Why this answer is correct
(1,2,3,4,6,12) सभी धन भाजक हैं, इसलिए यही रोस्टर रूप है। / (1,2,3,4,6,12) are all positive divisors, so this is the roster form.
Step 3
Exam Tip
भाजक लिखते समय (1) और स्वयं संख्या को छोड़ना आम गलती है। / A common mistake is to forget (1) and the number itself.
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यदि \(E={x:x\in N,\ x<5}\) और \(F={x:x\in W,\ x<5}\) हैं, तो सही कथन कौन सा है?
If \(E={x:x\in N,\ x<5}\) and \(F={x:x\in W,\ x<5}\), which statement is correct?
#sets
#natural-numbers
#whole-numbers
#subset
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A (E=F)
B \(E\subset F\)
C \(F\subset E\)
D \(E\cap F=\phi\)
Explanation opens after your attempt
Correct Answer
B. \(E\subset F\)
Step 1
Concept
(N) में \(1,2,3,\ldots\) आते हैं और (W) में \(0,1,2,3,\ldots\) आते हैं। / (N) contains \(1,2,3,\ldots\), while (W) contains \(0,1,2,3,\ldots\).
Step 2
Why this answer is correct
इसलिए \(E=\{1,2,3,4\}\) और \(F=\{0,1,2,3,4\}\), अतः \(E\subset F\)। / Thus \(E=\{1,2,3,4\}\) and \(F=\{0,1,2,3,4\}\), so \(E\subset F\).
Step 3
Exam Tip
प्राकृतिक और पूर्ण संख्याओं में (0) का अंतर याद रखें। / Remember the role of (0) in whole numbers.
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समुच्चय \(G={x:x\) एक स्वर है और (x) शब्द “गणित” में आता है(}) का रोस्टर रूप क्या होगा?
What is the roster form of the set \(G={x:x\) is a vowel and (x) occurs in the word “mathematics”(})?
#sets
#roster-form
#repeated-elements
#vowels
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A \(G=\{a,e,i\}\)
B \(G=\{a,e,i,o\}\)
C \(G=\{a,i\}\)
D \(G=\{a,a,e,i\}\)
Explanation opens after your attempt
Correct Answer
A. \(G=\{a,e,i\}\)
Step 1
Concept
शब्द में आने वाले स्वरों को पहचानना है, बार-बार आने वाले अक्षर अलग से नहीं लिखे जाते। / Identify the vowels in the word, but do not repeat an element in a set.
Step 2
Why this answer is correct
“mathematics” में (a,e,i) स्वर आते हैं, इसलिए समुच्चय ({a,e,i}) है। / The vowels appearing in “mathematics” are (a,e,i), so the set is ({a,e,i}).
Step 3
Exam Tip
समुच्चय में किसी अवयव की पुनरावृत्ति नहीं गिनी जाती। / Repeated elements are written only once in a set.
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यदि \(H=\{1,2,{3,4},5\}\) है, तो निम्न में से कौन सा कथन सत्य है?
If \(H=\{1,2,{3,4},5\}\), which of the following statements is true?
#sets
#element-of
#nested-set
#representation
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A \(3\in H\)
B \({3,4}\in H\)
C \(4\in H\)
D \({1,2}\in H\)
Explanation opens after your attempt
Correct Answer
B. \({3,4}\in H\)
Step 1
Concept
समुच्चय (H) के अवयव (1,2,{3,4},5) हैं। / The elements of (H) are (1,2,{3,4},5).
Step 2
Why this answer is correct
यहाँ ({3,4}) पूरा समुच्चय एक अवयव है, पर (3) और (4) अलग-अलग अवयव नहीं हैं। / Here ({3,4}) is one complete element, while (3) and (4) are not separate elements of (H).
Step 3
Exam Tip
समुच्चय के अंदर बने समुच्चय को एक अवयव की तरह देखें। / Treat a set inside another set as a single element.
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समुच्चय \(K={x:x\in Z,\ -3<x\le 2}\) का रोस्टर रूप कौन सा है?
Which is the roster form of \(K={x:x\in Z,\ -3<x\le 2}\)?
#sets
#integers
#inequality
#roster-form
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A \(K=\{-3,-2,-1,0,1,2\}\)
B \(K=\{-2,-1,0,1,2\}\)
C \(K=\{-2,-1,1,2\}\)
D \(K=\{-3,-2,-1,0,1\}\)
Explanation opens after your attempt
Correct Answer
B. \(K=\{-2,-1,0,1,2\}\)
Step 1
Concept
(x) पूर्णांक है और (-3) से बड़ा है, इसलिए (-3) शामिल नहीं होगा। / (x) is an integer greater than (-3), so (-3) is not included.
Step 2
Why this answer is correct
(2) तक बराबर की अनुमति है, इसलिए (2) शामिल होगा। अतः ({-2,-1,0,1,2}) सही है। / Equality is allowed at (2), so (2) is included. Hence ({-2,-1,0,1,2}) is correct.
Step 3
Exam Tip
खुली और बंद सीमा को ध्यान से पढ़ें। / Read open and closed boundary conditions carefully.
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यदि \(L={x:x=3n+1,\ n\in N,\ n\le 4}\) है, तो (L) का रोस्टर रूप क्या है?
If \(L={x:x=3n+1,\ n\in N,\ n\le 4}\), what is the roster form of (L)?
#sets
#set-builder
#sequence
#roster-form
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A \(L=\{1,4,7,10,13\}\)
B \(L=\{4,7,10,13\}\)
C \(L=\{3,6,9,12\}\)
D \(L=\{2,5,8,11\}\)
Explanation opens after your attempt
Correct Answer
B. \(L=\{4,7,10,13\}\)
Step 1
Concept
\(n\in N\) और \(n\le 4\) होने से (n=1,2,3,4) होंगे। / Since \(n\in N\) and \(n\le 4\), (n=1,2,3,4).
Step 2
Why this answer is correct
(x=3n+1) में मान रखने पर (4,7,10,13) मिलते हैं। / Substituting in (x=3n+1) gives (4,7,10,13).
Step 3
Exam Tip
(n=0) तभी लें जब (n) पूर्ण संख्या में दिया हो। / Use (n=0) only when whole numbers are specified.
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समुच्चय \(M={x:x\) (30) से छोटी (5) की धन गुणज संख्या है(}) का रोस्टर रूप कौन सा है?
Which is the roster form of \(M={x:x\) is a positive multiple of (5) less than (30})?
#sets
#multiples
#roster-form
#boundary-condition
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A \(M=\{0,5,10,15,20,25\}\)
B \(M=\{5,10,15,20,25\}\)
C \(M=\{5,10,15,20,25,30\}\)
D \(M=\{10,15,20,25\}\)
Explanation opens after your attempt
Correct Answer
B. \(M=\{5,10,15,20,25\}\)
Step 1
Concept
धन गुणज (5) से शुरू होंगे, (0) धन संख्या नहीं माना जाएगा। / Positive multiples of (5) start from (5), not (0).
Step 2
Why this answer is correct
(30) से छोटी शर्त के कारण (30) शामिल नहीं होगा, इसलिए ({5,10,15,20,25}) सही है। / Because the condition says less than (30), (30) is excluded. Thus ({5,10,15,20,25}) is correct.
Step 3
Exam Tip
“से छोटी” और “तक” में अंतर समझें। / Understand the difference between “less than” and “up to”.
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यदि \(R={x:x\in N,\ x^2<20}\) है, तो (R) कौन सा है?
If \(R={x:x\in N,\ x^2<20}\), which set is (R)?
#sets
#squares
#natural-numbers
#set-builder
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A \(R=\{1,2,3,4\}\)
B \(R=\{0,1,2,3,4\}\)
C \(R=\{1,2,3,4,5\}\)
D \(R=\{2,3,4\}\)
Explanation opens after your attempt
Correct Answer
A. \(R=\{1,2,3,4\}\)
Step 1
Concept
प्राकृतिक संख्याओं के वर्ग देखें: \(1^2,2^2,3^2,4^2\) सभी (20) से छोटे हैं। / Check squares of natural numbers: \(1^2,2^2,3^2,4^2\) are all less than (20).
Step 2
Why this answer is correct
\(5^2=25\) है, जो (20) से बड़ा है, इसलिए (5) शामिल नहीं होगा। / \(5^2=25\), which is greater than (20), so (5) is not included.
Step 3
Exam Tip
वर्ग वाली शर्तों में सीमा से पहले और बाद का मान जाँचें। / For square conditions, test values just before and after the limit.
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समुच्चय \(S={x:x\in Z,\ x^2=9}\) का सही रोस्टर रूप कौन सा है?
Which is the correct roster form of \(S={x:x\in Z,\ x^2=9}\)?
#sets
#integers
#square-equation
#roster-form
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A \(S=\{3\}\)
B \(S=\{-3\}\)
C \(S=\{-3,3\}\)
D \(S=\{0,3,9\}\)
Explanation opens after your attempt
Correct Answer
C. \(S=\{-3,3\}\)
Step 1
Concept
\(x^2=9\) के पूर्णांक हल (x=3) और (x=-3) हैं। / The integer solutions of \(x^2=9\) are (x=3) and (x=-3).
Step 2
Why this answer is correct
दोनों मान शर्त पूरी करते हैं, इसलिए \(S=\{-3,3\}\)। / Both satisfy the condition, so \(S=\{-3,3\}\).
Step 3
Exam Tip
वर्ग का मान समान आने पर ऋण मान को भी जाँचें। / When a square is given, always check the negative value too.
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यदि \(T={x:x\) (1) और (10) के बीच की विषम प्राकृतिक संख्या है(}) है, तो सही रोस्टर रूप कौन सा है?
If \(T={x:x\) is an odd natural number between (1) and (10}), which is the correct roster form?
#sets
#odd-numbers
#roster-form
#boundary-condition
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A \(T=\{1,3,5,7,9\}\)
B \(T=\{3,5,7,9\}\)
C \(T=\{1,3,5,7,9,10\}\)
D \(T=\{2,4,6,8\}\)
Explanation opens after your attempt
Correct Answer
B. \(T=\{3,5,7,9\}\)
Step 1
Concept
“बीच की” का सामान्य अर्थ है कि सीमाएँ शामिल नहीं होतीं। / The phrase “between” usually means the endpoints are not included.
Step 2
Why this answer is correct
(1) और (10) के बीच विषम प्राकृतिक संख्याएँ (3,5,7,9) हैं। / The odd natural numbers between (1) and (10) are (3,5,7,9).
Step 3
Exam Tip
शब्दों वाली सीमा में यह देखें कि किन सिरों को शामिल करना है। / In word-based boundary conditions, decide carefully whether endpoints are included.
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कौन सा विकल्प एकल समुच्चय को सही दिखाता है?
Which option correctly shows a singleton set?
#sets
#singleton-set
#natural-numbers
#inequality
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A \({x:x\in N,\ 2<x<4}\)
B \({x:x\in N,\ 2\le x\le 4}\)
C \({x:x\in N,\ x<2}\)
D \({x:x\in N,\ x^2<4}\)
Explanation opens after your attempt
Correct Answer
A. \({x:x\in N,\ 2<x<4}\)
Step 1
Concept
एकल समुच्चय में केवल एक अवयव होता है। / A singleton set has exactly one element.
Step 2
Why this answer is correct
(2<x<4) और \(x\in N\) से केवल (x=3) मिलता है। / From (2<x<4) and \(x\in N\), only (x=3) is possible.
Step 3
Exam Tip
एकल समुच्चय पहचानने के लिए संभावित अवयव गिनें। / To identify a singleton set, count the possible elements carefully.
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यदि \(U={x:x\) शब्द “समुच्चय” के भिन्न अक्षर हैं(}), तो अवयवों की संख्या क्या होगी?
If \(U={x:x\) is a distinct letter of the word “collection”(}), what is the number of elements?
#sets
#distinct-elements
#cardinality
#representation
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A (8)
B (9)
C (10)
D (7)
Explanation opens after your attempt
Step 1
Concept
समुच्चय में दोहराए गए अक्षर एक बार ही लिखे जाते हैं। / Repeated letters are written only once in a set.
Step 2
Why this answer is correct
“collection” के भिन्न अक्षर (c,o,l,e,t,i,n) हैं, कुल (8) अवयव हैं। / The distinct letters of “collection” are (c,o,l,e,t,i,n), giving (8) elements.
Step 3
Exam Tip
अक्षर वाले समुच्चय में पुनरावृत्ति को गिनती में शामिल न करें। / In letter-based sets, do not count repetition.
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समुच्चय \(V={x:x\in N,\ x\) (24) का भाजक है और (x) सम है(}) क्या है?
What is the set \(V={x:x\in N,\ x\) is a divisor of (24) and (x) is even(})?
#sets
#divisors
#even-numbers
#set-builder
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A \(V=\{2,4,6,8,12,24\}\)
B \(V=\{1,2,3,4,6,8,12,24\}\)
C \(V=\{2,4,6,12,24\}\)
D \(V=\{4,8,12,24\}\)
Explanation opens after your attempt
Correct Answer
A. \(V=\{2,4,6,8,12,24\}\)
Step 1
Concept
(24) के धन भाजक (1,2,3,4,6,8,12,24) हैं। / The positive divisors of (24) are (1,2,3,4,6,8,12,24).
Step 2
Why this answer is correct
इनमें सम भाजक (2,4,6,8,12,24) हैं। / The even divisors among them are (2,4,6,8,12,24).
Step 3
Exam Tip
दो शर्तों वाले समुच्चय में दोनों शर्तें एक साथ लागू करें। / For sets with two conditions, apply both conditions together.
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यदि \(A={x:x=2n-1,\ n\in N,\ n\le 5}\), तो (A) का रोस्टर रूप कौन सा है?
If \(A={x:x=2n-1,\ n\in N,\ n\le 5}\), which is the roster form of (A)?
#sets
#odd-numbers
#set-builder
#roster-form
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A \(A=\{1,3,5,7,9\}\)
B \(A=\{0,1,3,5,7\}\)
C \(A=\{2,4,6,8,10\}\)
D \(A=\{3,5,7,9,11\}\)
Explanation opens after your attempt
Correct Answer
A. \(A=\{1,3,5,7,9\}\)
Step 1
Concept
(n=1,2,3,4,5) होंगे। / Here (n=1,2,3,4,5).
Step 2
Why this answer is correct
(2n-1) में रखने पर (1,3,5,7,9) मिलते हैं। / Substituting in (2n-1) gives (1,3,5,7,9).
Step 3
Exam Tip
(2n-1) सामान्यतः पहली (n) विषम प्राकृतिक संख्याएँ देता है। / (2n-1) usually represents the first (n) odd natural numbers.
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कौन सा विकल्प अनंत समुच्चय को दर्शाता है?
Which option represents an infinite set?
#sets
#infinite-set
#multiples
#finite-set
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A \({x:x\in N,\ x<100}\)
B \({x:x\in N,\ x\) (2) का गुणज है(})
C \({x:x\in Z,\ -5<x<5}\)
D \({x:x\in N,\ x^2=25}\)
Explanation opens after your attempt
Correct Answer
B. \({x:x\in N,\ x\) (2) का गुणज है(})
Step 1
Concept
अनंत समुच्चय में अवयवों की संख्या समाप्त नहीं होती। / An infinite set has no last element.
Step 2
Why this answer is correct
(2) के प्राकृतिक गुणज \(2,4,6,\ldots\) बिना अंत तक चलते हैं, इसलिए यह अनंत समुच्चय है। / Natural multiples of (2), such as \(2,4,6,\ldots\), continue without end.
Step 3
Exam Tip
सीमा दी हो तो समुच्चय अक्सर सीमित हो जाता है। / When a boundary is given, the set often becomes finite.
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यदि \(B={x:x\in Z,\ |x|<3}\) है, तो (B) का रोस्टर रूप क्या होगा?
If \(B={x:x\in Z,\ |x|<3}\), what is the roster form of (B)?
#sets
#absolute-value
#integers
#roster-form
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A \(B=\{-3,-2,-1,0,1,2,3\}\)
B \(B=\{-2,-1,0,1,2\}\)
C \(B=\{-2,-1,1,2\}\)
D \(B=\{0,1,2\}\)
Explanation opens after your attempt
Correct Answer
B. \(B=\{-2,-1,0,1,2\}\)
Step 1
Concept
(|x|<3) का अर्थ है (x) की दूरी (0) से (3) से कम हो।
Step 2
Why this answer is correct
पूर्णांक मान (-2,-1,0,1,2) हैं। / The integer values are (-2,-1,0,1,2).
Step 3
Exam Tip
परिमाण वाली शर्त में ऋण और धन दोनों ओर के मान देखें। / For absolute value conditions, check both negative and positive sides.
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समुच्चय \(C={x:x\in N,\ 3x\le 15}\) का सही रोस्टर रूप कौन सा है?
Which is the correct roster form of \(C={x:x\in N,\ 3x\le 15}\)?
#sets
#inequality
#natural-numbers
#roster-form
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A \(C=\{0,1,2,3,4,5\}\)
B \(C=\{1,2,3,4,5\}\)
C \(C=\{1,2,3,4\}\)
D \(C=\{3,6,9,12,15\}\)
Explanation opens after your attempt
Correct Answer
B. \(C=\{1,2,3,4,5\}\)
Step 1
Concept
\(3x\le 15\) से \(x\le 5\) मिलता है। / From \(3x\le 15\), we get \(x\le 5\).
Step 2
Why this answer is correct
\(x\in N\) होने से (x=1,2,3,4,5) होंगे। / Since \(x\in N\), the possible values are (1,2,3,4,5).
Step 3
Exam Tip
असमानता हल करने के बाद भी दिए गए संख्या-समुच्चय को याद रखें। / After solving an inequality, always apply the given number set.
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यदि \(D={x:x\) (50) से छोटी (7) की धन गुणज संख्या है(}), तो (D) में अवयवों की संख्या कितनी है?
If \(D={x:x\) is a positive multiple of (7) less than (50}), how many elements are there in (D)?
#sets
#multiples
#cardinality
#roster-form
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A (6)
B (7)
C (8)
D (9)
Explanation opens after your attempt
Step 1
Concept
(50) से छोटी (7) की धन गुणज संख्याएँ (7,14,21,28,35,42,49) हैं। / The positive multiples of (7) less than (50) are (7,14,21,28,35,42,49).
Step 2
Why this answer is correct
कुल (7) अवयव हैं। / There are (7) elements.
Step 3
Exam Tip
गिनती करते समय अंतिम गुणज को सीमा से तुलना करके ही शामिल करें। / While counting multiples, compare the last multiple with the boundary.
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कौन सा समुच्चय ({1,4,9,16,25}) को सही समुच्चय-निर्माण रूप में दिखाता है?
Which set correctly represents ({1,4,9,16,25}) in set-builder form?
#sets
#set-builder
#squares
#pattern
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A \({x:x=n^2,\ n\in N,\ 1\le n\le 5}\)
B \({x:x=2n,\ n\in N,\ 1\le n\le 5}\)
C \({x:x=n+3,\ n\in N,\ 1\le n\le 5}\)
D \({x:x=3n,\ n\in N,\ 1\le n\le 5}\)
Explanation opens after your attempt
Correct Answer
A. \({x:x=n^2,\ n\in N,\ 1\le n\le 5}\)
Step 1
Concept
दिए गए अवयव (1,4,9,16,25) पहली पाँच प्राकृतिक संख्याओं के वर्ग हैं। / The elements (1,4,9,16,25) are the squares of the first five natural numbers.
Step 2
Why this answer is correct
इसलिए \(x=n^2\), जहाँ \(1\le n\le 5\), सही रूप है। / Hence \(x=n^2\), where \(1\le n\le 5\), is correct.
Step 3
Exam Tip
रोस्टर देखकर पहले क्रम का नियम पहचानें। / First identify the pattern in the roster form.
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यदि \(E={x:x\in Z,\ x^2-5x+6=0}\), तो (E) क्या है?
If \(E={x:x\in Z,\ x^2-5x+6=0}\), what is (E)?
#sets
#quadratic-equation
#set-builder
#roster-form
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A \(E=\{2,3\}\)
B \(E=\{-2,-3\}\)
C \(E=\{1,6\}\)
D \(E=\{0,2,3\}\)
Explanation opens after your attempt
Correct Answer
A. \(E=\{2,3\}\)
Step 1
Concept
\(x^2-5x+6=0\) को ((x-2)(x-3)=0) लिखा जा सकता है। / \(x^2-5x+6=0\) can be written as ((x-2)(x-3)=0).
Step 2
Why this answer is correct
इसलिए (x=2) या (x=3), अतः \(E=\{2,3\}\)। / So (x=2) or (x=3), hence \(E=\{2,3\}\).
Step 3
Exam Tip
द्विघात शर्त वाले समुच्चय में हल ही अवयव बनते हैं। / In a set defined by a quadratic condition, the solutions become the elements.
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कौन सा कथन समुच्चय \(F=\{0\}\) के बारे में सही है?
Which statement about the set \(F=\{0\}\) is correct?
#sets
#singleton-set
#empty-set
#zero
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A (F) रिक्त समुच्चय है / (F) is an empty set
B (F) एकल समुच्चय है / (F) is a singleton set
C \(F=\phi\)
D (F) में कोई अवयव नहीं है / (F) has no element
Explanation opens after your attempt
Correct Answer
B. (F) एकल समुच्चय है / (F) is a singleton set
Step 1
Concept
({0}) में (0) एक अवयव के रूप में मौजूद है। / The set ({0}) contains (0) as an element.
Step 2
Why this answer is correct
इसलिए यह रिक्त नहीं, बल्कि एकल समुच्चय है। / Therefore it is not empty; it is a singleton set.
Step 3
Exam Tip
\(\phi\) और ({0}) को कभी समान न मानें। / Never treat \(\phi\) and ({0}) as the same.
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यदि \(G={x:x\in N,\ x\) (18) और (24) दोनों का सामान्य भाजक है(}), तो (G) कौन सा है?
If \(G={x:x\in N,\ x\) is a common divisor of (18) and (24}), which set is (G)?
#sets
#common-divisors
#roster-form
#set-builder
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A \(G=\{1,2,3,6\}\)
B \(G=\{2,3,6,9\}\)
C \(G=\{1,2,3,4,6\}\)
D \(G=\{6,12,18\}\)
Explanation opens after your attempt
Correct Answer
A. \(G=\{1,2,3,6\}\)
Step 1
Concept
(18) के भाजक (1,2,3,6,9,18) हैं। / Divisors of (18) are (1,2,3,6,9,18).
Step 2
Why this answer is correct
(24) के साथ सामान्य भाजक (1,2,3,6) हैं, इसलिए यही समुच्चय है। / The common divisors with (24) are (1,2,3,6), so this is the set.
Step 3
Exam Tip
सामान्य भाजक में दोनों संख्याओं को साथ-साथ जाँचें। / For common divisors, test both numbers together.
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समुच्चय \(H={x:x\in Z,\ -2\le x<3}\) में अवयवों की संख्या कितनी है?
How many elements are there in \(H={x:x\in Z,\ -2\le x<3}\)?
#sets
#integers
#cardinality
#inequality
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A (4)
B (5)
C (6)
D (3)
Explanation opens after your attempt
Step 1
Concept
\(-2\le x<3\) में (-2) शामिल है पर (3) शामिल नहीं है। / In \(-2\le x<3\), (-2) is included but (3) is not included.
Step 2
Why this answer is correct
पूर्णांक (-2,-1,0,1,2) हैं, कुल (5) अवयव। / The integers are (-2,-1,0,1,2), so there are (5) elements.
Step 3
Exam Tip
गिनती से पहले पूरा रोस्टर लिखना सुरक्षित तरीका है। / Writing the roster first is a safe way to count.
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यदि \(I={x:x\) (100) से छोटी दो अंकों वाली (11) की गुणज संख्या है(}), तो (I) का रोस्टर रूप क्या है?
If \(I={x:x\) is a two-digit multiple of (11) less than (100}), what is the roster form of (I)?
#sets
#multiples
#two-digit-numbers
#roster-form
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A \(I=\{11,22,33,44,55,66,77,88,99\}\)
B \(I=\{0,11,22,33,44,55,66,77,88,99\}\)
C \(I=\{22,33,44,55,66,77,88\}\)
D \(I=\{11,22,33,44,55,66,77,88\}\)
Explanation opens after your attempt
Correct Answer
A. \(I=\{11,22,33,44,55,66,77,88,99\}\)
Step 1
Concept
दो अंकों वाली संख्याएँ (10) से (99) तक होती हैं। / Two-digit numbers range from (10) to (99).
Step 2
Why this answer is correct
(11) की ऐसी गुणज संख्याएँ (11,22,33,44,55,66,77,88,99) हैं। / The multiples of (11) in this range are (11,22,33,44,55,66,77,88,99).
Step 3
Exam Tip
(100) से छोटी शर्त में (99) शामिल हो सकता है। / Under the condition less than (100), (99) can be included.
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यदि \(J={x:x\in N,\ x^2-10x+21=0}\), तो (J) का रोस्टर रूप कौन सा है?
If \(J={x:x\in N,\ x^2-10x+21=0}\), which is the roster form of (J)?
#sets
#quadratic-equation
#natural-numbers
#roster-form
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A \(J=\{3,7\}\)
B \(J=\{-3,-7\}\)
C \(J=\{1,21\}\)
D \(J=\{0,3,7\}\)
Explanation opens after your attempt
Correct Answer
A. \(J=\{3,7\}\)
Step 1
Concept
\(x^2-10x+21=0\) को ((x-3)(x-7)=0) लिखा जा सकता है। / \(x^2-10x+21=0\) can be written as ((x-3)(x-7)=0).
Step 2
Why this answer is correct
(x=3) या (x=7), और दोनों प्राकृतिक संख्याएँ हैं। / (x=3) or (x=7), and both are natural numbers.
Step 3
Exam Tip
हल निकालने के बाद दिए गए क्षेत्र से मिलान करें। / After solving, match the solutions with the given domain.
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किस विकल्प में \(A=\{a,b,c\}\) को सही रूप से वर्णित किया गया है?
Which option correctly describes \(A=\{a,b,c\}\)?
#sets
#descriptive-form
#roster-form
#letters
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A \(A={x:x\) अंग्रेजी वर्णमाला के पहले तीन अक्षर हैं(}) / \(A={x:x\) is one of the first three letters of the English alphabet(})
B \(A={x:x\) अंग्रेजी वर्णमाला के अंतिम तीन अक्षर हैं(}) / \(A={x:x\) is one of the last three letters of the English alphabet(})
C \(A={x:x\) स्वर है(}) / \(A={x:x\) is a vowel(})
D \(A={x:x\) व्यंजन है(}) / \(A={x:x\) is a consonant(})
Explanation opens after your attempt
Correct Answer
A. \(A={x:x\) अंग्रेजी वर्णमाला के पहले तीन अक्षर हैं(}) / \(A={x:x\) is one of the first three letters of the English alphabet(})
Step 1
Concept
(a,b,c) अंग्रेजी वर्णमाला के पहले तीन अक्षर हैं। / (a,b,c) are the first three letters of the English alphabet.
Step 2
Why this answer is correct
इसलिए दिया गया वर्णन इन्हीं तीन अवयवों को ठीक से बताता है। / Therefore the description correctly gives exactly these three elements.
Step 3
Exam Tip
वर्णनात्मक रूप में ऐसी शर्त लिखें जो न ज्यादा अवयव दे, न कम। / In descriptive form, write a condition that gives neither extra nor missing elements.
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यदि \(K={x:x\in Z,\ x^3=x}\), तो (K) कौन सा है?
If \(K={x:x\in Z,\ x^3=x}\), which set is (K)?
#sets
#integers
#cubic-equation
#set-builder
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A \(K=\{-1,0,1\}\)
B \(K=\{0,1\}\)
C \(K=\{-1,1\}\)
D \(K=\{1\}\)
Explanation opens after your attempt
Correct Answer
A. \(K=\{-1,0,1\}\)
Step 1
Concept
\(x^3=x\) से \(x^3-x=0\), यानी (x(x-1)(x+1)=0) मिलता है। / From \(x^3=x\), we get \(x^3-x=0\), so (x(x-1)(x+1)=0).
Step 2
Why this answer is correct
हल (-1,0,1) हैं और ये सभी पूर्णांक हैं। / The solutions are (-1,0,1), and all are integers.
Step 3
Exam Tip
समीकरण को गुणनखंड में बदलना समुच्चय के अवयव जल्दी देता है। / Factoring the equation helps find set elements quickly.
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समुच्चय \(L={x:x\in N,\ x\) (36) का भाजक है और (x>6}) क्या है?
What is the set \(L={x:x\in N,\ x\) is a divisor of (36) and (x>6})?
#sets
#divisors
#inequality
#roster-form
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A \(L=\{9,12,18,36\}\)
B \(L=\{6,9,12,18,36\}\)
C \(L=\{1,2,3,4,6\}\)
D \(L=\{8,9,12,18,36\}\)
Explanation opens after your attempt
Correct Answer
A. \(L=\{9,12,18,36\}\)
Step 1
Concept
(36) के धन भाजक (1,2,3,4,6,9,12,18,36) हैं। / The positive divisors of (36) are (1,2,3,4,6,9,12,18,36).
Step 2
Why this answer is correct
(6) से बड़े भाजक (9,12,18,36) हैं। / The divisors greater than (6) are (9,12,18,36).
Step 3
Exam Tip
“से बड़ा” में बराबर शामिल नहीं होता। / “Greater than” does not include equality.
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कौन सा विकल्प ({2,3,5,7}) को सही ढंग से बताता है?
Which option correctly describes ({2,3,5,7})?
#sets
#prime-numbers
#descriptive-form
#representation
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A (x) (10) से छोटी अभाज्य प्राकृतिक संख्या है / (x) is a prime natural number less than (10)
B (x) (10) से छोटी विषम प्राकृतिक संख्या है / (x) is an odd natural number less than (10)
C (x) (10) से छोटी सम प्राकृतिक संख्या है / (x) is an even natural number less than (10)
D (x) (10) से छोटी भाज्य प्राकृतिक संख्या है / (x) is a composite natural number less than (10)
Explanation opens after your attempt
Correct Answer
A. (x) (10) से छोटी अभाज्य प्राकृतिक संख्या है / (x) is a prime natural number less than (10)
Step 1
Concept
(2,3,5,7) सभी (10) से छोटी अभाज्य प्राकृतिक संख्याएँ हैं। / (2,3,5,7) are all prime natural numbers less than (10).
Step 2
Why this answer is correct
विषम संख्याओं में (1,9) भी आ जाते और (2) छूट जाता, इसलिए वह सही नहीं है। / Odd numbers would include (1,9) and exclude (2), so that description is not correct.
Step 3
Exam Tip
वर्णन चुनते समय हर अवयव और कोई अतिरिक्त अवयव दोनों जाँचें। / Check both included elements and unwanted extra elements.
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यदि \(M={x:x\in W,\ x^2<10}\), तो (M) क्या है?
If \(M={x:x\in W,\ x^2<10}\), what is (M)?
#sets
#whole-numbers
#squares
#roster-form
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A \(M=\{1,2,3\}\)
B \(M=\{0,1,2,3\}\)
C \(M=\{-3,-2,-1,0,1,2,3\}\)
D \(M=\{0,1,2,3,4\}\)
Explanation opens after your attempt
Correct Answer
B. \(M=\{0,1,2,3\}\)
Step 1
Concept
पूर्ण संख्याएँ \(0,1,2,3,\ldots\) होती हैं। / Whole numbers are \(0,1,2,3,\ldots\).
Step 2
Why this answer is correct
\(0^2,1^2,2^2,3^2\) (10) से छोटे हैं, पर \(4^2=16\) नहीं। इसलिए \(M=\{0,1,2,3\}\)। / \(0^2,1^2,2^2,3^2\) are less than (10), but \(4^2=16\) is not. So \(M=\{0,1,2,3\}\).
Step 3
Exam Tip
पूर्ण संख्याओं में (0) को शामिल करना न भूलें। / Remember to include (0) in whole numbers.
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समुच्चय \(N={x:x\in N,\ 15<x<25,\ x\) अभाज्य है(}) का रोस्टर रूप कौन सा है?
Which is the roster form of \(N={x:x\in N,\ 15<x<25,\ x\) is prime(})?
#sets
#prime-numbers
#roster-form
#set-builder
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A \(N=\{17,19,23\}\)
B \(N=\{16,17,19,23\}\)
C \(N=\{17,19,21,23\}\)
D \(N=\{17,19,23,25\}\)
Explanation opens after your attempt
Correct Answer
A. \(N=\{17,19,23\}\)
Step 1
Concept
(15) और (25) के बीच प्राकृतिक संख्याएँ देखें। / Look at the natural numbers between (15) and (25).
Step 2
Why this answer is correct
इनमें अभाज्य संख्याएँ (17,19,23) हैं। (21) और (25) अभाज्य नहीं हैं। / The primes among them are (17,19,23). (21) and (25) are not prime.
Step 3
Exam Tip
अभाज्य पहचानते समय विभाज्यता की जल्दी जाँच करें। / Use quick divisibility checks to identify primes.
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यदि \(O={x:x\in N,\ x\le 10,\ x\) (2) या (5) से विभाज्य है(}), तो (O) क्या है?
If \(O={x:x\in N,\ x\le 10,\ x\) is divisible by (2) or (5}), what is (O)?
#sets
#divisibility
#or-condition
#roster-form
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A \(O=\{2,4,5,6,8,10\}\)
B \(O=\{2,4,6,8\}\)
C \(O=\{5,10\}\)
D \(O=\{2,4,5,6,8\}\)
Explanation opens after your attempt
Correct Answer
A. \(O=\{2,4,5,6,8,10\}\)
Step 1
Concept
(10) तक (2) से विभाज्य संख्याएँ (2,4,6,8,10) हैं। / Numbers up to (10) divisible by (2) are (2,4,6,8,10).
Step 2
Why this answer is correct
(5) से विभाज्य संख्याएँ (5,10) हैं, संयुक्त रूप से ({2,4,5,6,8,10}) मिलता है। / Numbers divisible by (5) are (5,10), so together we get ({2,4,5,6,8,10}).
Step 3
Exam Tip
“या” में दोनों शर्तों से मिलने वाले सभी अवयव लें, दोहराव एक बार लिखें। / With “or”, include elements satisfying either condition, but write duplicates once.
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कौन सा विकल्प ({4,8,12,16,20}) का सही समुच्चय-निर्माण रूप है?
Which option is the correct set-builder form of ({4,8,12,16,20})?
#sets
#set-builder
#multiples
#pattern
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A \({x:x=4n,\ n\in N,\ 1\le n\le 5}\)
B \({x:x=2n,\ n\in N,\ 1\le n\le 5}\)
C \({x:x=n^2,\ n\in N,\ 1\le n\le 5}\)
D \({x:x=4n+1,\ n\in N,\ 1\le n\le 5}\)
Explanation opens after your attempt
Correct Answer
A. \({x:x=4n,\ n\in N,\ 1\le n\le 5}\)
Step 1
Concept
सभी अवयव (4) के प्रथम पाँच धन गुणज हैं। / All elements are the first five positive multiples of (4).
Step 2
Why this answer is correct
(x=4n) और \(1\le n\le 5\) रखने से (4,8,12,16,20) मिलते हैं। / (x=4n) with \(1\le n\le 5\) gives (4,8,12,16,20).
Step 3
Exam Tip
गुणज वाले समुच्चय में गुणनांक को ठीक पहचानें। / In multiple-based sets, identify the multiplier correctly.
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यदि \(P={x:x\in Z,\ -1\le x\le 1}\), तो कौन सा कथन सही है?
If \(P={x:x\in Z,\ -1\le x\le 1}\), which statement is correct?
#sets
#integers
#inequality
#roster-form
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A \(P=\{-1,0,1\}\)
B \(P=\{0,1\}\)
C \(P=\{-1,1\}\)
D \(P=\{1\}\)
Explanation opens after your attempt
Correct Answer
A. \(P=\{-1,0,1\}\)
Step 1
Concept
(x) पूर्णांक है और (-1) से (1) तक बराबर सहित है। / (x) is an integer and the interval includes both (-1) and (1).
Step 2
Why this answer is correct
इसलिए (-1,0,1) तीनों अवयव शामिल होंगे। / Therefore (-1,0,1) are all included.
Step 3
Exam Tip
(0) पूर्णांक है, इसे बीच की गिनती में न छोड़ें। / (0) is an integer, so do not skip it while listing values.
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समुच्चय \(Q={x:x\in N,\ x\) (20) से छोटा है और (x) न तो (2) से न (3) से विभाज्य है(}) कौन सा है?
Which is the set \(Q={x:x\in N,\ x\) is less than (20) and (x) is divisible by neither (2) nor (3})?
#sets
#divisibility
#neither-condition
#roster-form
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A \(Q=\{1,5,7,11,13,17,19\}\)
B \(Q=\{5,7,11,13,17,19\}\)
C \(Q=\{1,3,5,7,9,11,13,15,17,19\}\)
D \(Q=\{2,4,6,8,10,12,14,16,18\}\)
Explanation opens after your attempt
Correct Answer
A. \(Q=\{1,5,7,11,13,17,19\}\)
Step 1
Concept
(20) से छोटी प्राकृतिक संख्याओं में वे चुनें जो (2) और (3) दोनों से विभाज्य न हों। / From natural numbers less than (20), choose those not divisible by both (2) and (3).
Step 2
Why this answer is correct
ऐसे अवयव (1,5,7,11,13,17,19) हैं। / The elements are (1,5,7,11,13,17,19).
Step 3
Exam Tip
“न तो” वाली शर्त में दोनों विभाज्यताओं को हटाएँ। / For “neither” conditions, remove numbers satisfying each excluded divisibility.
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यदि \(R={x:x\in N,\ x+4=4}\), तो (R) क्या है?
If \(R={x:x\in N,\ x+4=4}\), what is (R)?
#sets
#empty-set
#natural-numbers
#equation
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A \(R=\{0\}\)
B \(R=\{4\}\)
C \(R=\phi\)
D \(R=\{1\}\)
Explanation opens after your attempt
Correct Answer
C. \(R=\phi\)
Step 1
Concept
(x+4=4) से (x=0) मिलता है। / From (x+4=4), we get (x=0).
Step 2
Why this answer is correct
लेकिन \(x\in N\) है और यहाँ प्राकृतिक संख्याएँ (1) से शुरू मानी जाती हैं, इसलिए कोई अवयव नहीं है। / But \(x\in N\), and here natural numbers start from (1), so there is no element.
Step 3
Exam Tip
हल मिलने के बाद यह देखना जरूरी है कि वह दिए गए समुच्चय में आता है या नहीं। / After solving, always check whether the solution belongs to the given domain.
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कौन सा विकल्प \(\phi\) और \({\phi}\) के बारे में सही है?
Which option about \(\phi\) and \({\phi}\) is correct?
#sets
#empty-set
#singleton-set
#nested-set
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A \(\phi={\phi}\)
B \(\phi\) में एक अवयव है / \(\phi\) has one element
C \({\phi}\) में एक अवयव है / \({\phi}\) has one element
D दोनों रिक्त समुच्चय हैं / Both are empty sets
Explanation opens after your attempt
Correct Answer
C. \({\phi}\) में एक अवयव है / \({\phi}\) has one element
Step 1
Concept
\(\phi\) रिक्त समुच्चय है, इसमें कोई अवयव नहीं होता। / \(\phi\) is the empty set and has no element.
Step 2
Why this answer is correct
\({\phi}\) में \(\phi\) स्वयं एक अवयव है, इसलिए इसमें एक अवयव है। / \({\phi}\) contains \(\phi\) itself as one element.
Step 3
Exam Tip
किसी समुच्चय को अवयव के रूप में रखने से नया समुच्चय रिक्त नहीं रहता। / Putting a set as an element makes a new set that is not empty.
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यदि \(S={x:x\in N,\ x\) (8) का गुणज है और (x<50}), तो (S) का रोस्टर रूप क्या है?
If \(S={x:x\in N,\ x\) is a multiple of (8) and (x<50}), what is the roster form of (S)?
#sets
#multiples
#natural-numbers
#roster-form
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A \(S=\{8,16,24,32,40,48\}\)
B \(S=\{0,8,16,24,32,40,48\}\)
C \(S=\{8,16,24,32,40,48,56\}\)
D \(S=\{16,24,32,40,48\}\)
Explanation opens after your attempt
Correct Answer
A. \(S=\{8,16,24,32,40,48\}\)
Step 1
Concept
(8) के धन गुणज \(8,16,24,32,40,48,\ldots\) हैं। / The positive multiples of (8) are \(8,16,24,32,40,48,\ldots\).
Step 2
Why this answer is correct
(50) से छोटे गुणज (8,16,24,32,40,48) तक ही हैं। / The multiples less than (50) stop at (48).
Step 3
Exam Tip
धन प्राकृतिक गुणज में (0) शामिल नहीं किया जाता। / (0) is not included among positive natural multiples.
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समुच्चय \(T={x:x\in Z,\ x^2\le 4}\) में कितने अवयव हैं?
How many elements are there in \(T={x:x\in Z,\ x^2\le 4}\)?
#sets
#integers
#square-inequality
#cardinality
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A (3)
B (4)
C (5)
D (6)
Explanation opens after your attempt
Step 1
Concept
\(x^2\le 4\) के पूर्णांक मान (-2,-1,0,1,2) हैं। / The integer values satisfying \(x^2\le 4\) are (-2,-1,0,1,2).
Step 2
Why this answer is correct
ये कुल (5) अवयव बनाते हैं। / These form (5) elements.
Step 3
Exam Tip
वर्ग वाली असमानता में शून्य और दोनों ओर के मान शामिल करें। / For square inequalities, include zero and values on both sides.
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यदि \(U={x:x\in N,\ 2x+1<12}\), तो (U) कौन सा है?
If \(U={x:x\in N,\ 2x+1<12}\), which set is (U)?
#sets
#inequality
#natural-numbers
#set-builder
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A \(U=\{1,2,3,4,5\}\)
B \(U=\{0,1,2,3,4,5\}\)
C \(U=\{1,2,3,4\}\)
D \(U=\{2,3,4,5\}\)
Explanation opens after your attempt
Correct Answer
A. \(U=\{1,2,3,4,5\}\)
Step 1
Concept
(2x+1<12) से (2x<11), इसलिए \(x<\frac{11}{2}\)। / From (2x+1<12), we get (2x<11), so \(x<\frac{11}{2}\).
Step 2
Why this answer is correct
प्राकृतिक मान (1,2,3,4,5) होंगे। / The natural values are (1,2,3,4,5).
Step 3
Exam Tip
असमानता में भिन्न सीमा आने पर पूर्णांक मान अलग से चुनें। / When an inequality gives a fractional boundary, choose integer values carefully.
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कौन सा विकल्प समुच्चय ({0,1,8,27,64}) को सही निर्माण रूप देता है?
Which option gives the correct set-builder form for ({0,1,8,27,64})?
#sets
#set-builder
#cubes
#whole-numbers
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A \({x:x=n^3,\ n\in W,\ 0\le n\le 4}\)
B \({x:x=n^2,\ n\in W,\ 0\le n\le 4}\)
C \({x:x=3n,\ n\in W,\ 0\le n\le 4}\)
D \({x:x=2^n,\ n\in W,\ 0\le n\le 4}\)
Explanation opens after your attempt
Correct Answer
A. \({x:x=n^3,\ n\in W,\ 0\le n\le 4}\)
Step 1
Concept
(0,1,8,27,64) क्रमशः \(0^3,1^3,2^3,3^3,4^3\) हैं। / (0,1,8,27,64) are \(0^3,1^3,2^3,3^3,4^3\).
Step 2
Why this answer is correct
इसलिए \(x=n^3,\ n\in W,\ 0\le n\le 4\) सही है। / Thus \(x=n^3,\ n\in W,\ 0\le n\le 4\) is correct.
Step 3
Exam Tip
घन और वर्ग के पैटर्न को अलग-अलग पहचानें। / Distinguish cube patterns from square patterns.
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यदि \(V={x:x\in N,\ x\) (9) और (12) का सामान्य गुणज है तथा \(x\le 100}\), तो (V) क्या है?
If \(V={x:x\in N,\ x\) is a common multiple of (9) and (12), and \(x\le 100}\), what is (V)?
#sets
#common-multiples
#lcm
#roster-form
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A \(V=\{36,72\}\)
B \(V=\{9,12,36,72\}\)
C \(V=\{18,36,54,72,90\}\)
D \(V=\{72\}\)
Explanation opens after your attempt
Correct Answer
A. \(V=\{36,72\}\)
Step 1
Concept
(9) और (12) का लघुत्तम सामान्य गुणज (36) है। / The least common multiple of (9) and (12) is (36).
Step 2
Why this answer is correct
(100) तक (36) के धन गुणज (36,72) हैं। / The positive multiples of (36) up to (100) are (36,72).
Step 3
Exam Tip
सामान्य गुणज में पहले लघुत्तम सामान्य गुणज निकालना तेज तरीका है। / For common multiples, first find the least common multiple.
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समुच्चय \(W={x:x\in Z,\ -4<x<4,\ x\) सम है(}) का रोस्टर रूप कौन सा है?
Which is the roster form of \(W={x:x\in Z,\ -4<x<4,\ x\) is even(})?
#sets
#even-integers
#integers
#roster-form
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A \(W=\{-4,-2,0,2,4\}\)
B \(W=\{-2,0,2\}\)
C \(W=\{-3,-1,1,3\}\)
D \(W=\{-2,2\}\)
Explanation opens after your attempt
Correct Answer
B. \(W=\{-2,0,2\}\)
Step 1
Concept
(-4) और (4) के बीच पूर्णांक (-3,-2,-1,0,1,2,3) हैं। / The integers between (-4) and (4) are (-3,-2,-1,0,1,2,3).
Step 2
Why this answer is correct
इनमें सम पूर्णांक (-2,0,2) हैं। / The even integers among them are (-2,0,2).
Step 3
Exam Tip
सम पूर्णांकों में (0) भी शामिल होता है। / (0) is also an even integer.
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यदि \(X={x:x\in N,\ x^2\) विषम है और (x<8}), तो (X) क्या है?
If \(X={x:x\in N,\ x^2\) is odd and (x<8}), what is (X)?
#sets
#odd-numbers
#squares
#natural-numbers
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A \(X=\{1,3,5,7\}\)
B \(X=\{2,4,6\}\)
C \(X=\{1,2,3,4,5,6,7\}\)
D \(X=\{3,5,7\}\)
Explanation opens after your attempt
Correct Answer
A. \(X=\{1,3,5,7\}\)
Step 1
Concept
किसी प्राकृतिक संख्या का वर्ग विषम तभी होता है जब संख्या स्वयं विषम हो। / The square of a natural number is odd exactly when the number itself is odd.
Step 2
Why this answer is correct
(8) से छोटी विषम प्राकृतिक संख्याएँ (1,3,5,7) हैं। / The odd natural numbers less than (8) are (1,3,5,7).
Step 3
Exam Tip
वर्ग की सम-विषम प्रकृति मूल संख्या जैसी रहती है। / The parity of a square matches the parity of the original integer.
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\(समुच्चय (A={x:x\) एक अभाज्य संख्या है और \(10<x<30}) को सूची रूप में लिखने पर कौन सा समुच्चय मिलेगा\)?
\(If (A={x:x\) is a prime number and \(10<x<30}), which set is obtained in roster form\)?
#sets
#roster
#set-builder
#prime-numbers
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A \(A=\{11,13,17,19,23,29\}\)
B \(A=\{12,13,17,19,23,29\}\)
C \(A=\{11,15,17,21,23,29\}\)
D \(A=\{10,11,13,17,19,23,29,30\}\)
Explanation opens after your attempt
Correct Answer
A. \(A=\{11,13,17,19,23,29\}\)
Step 1
Concept
दी गई शर्त में (10) और (30) के बीच की अभाज्य संख्याएँ लेनी हैं। / The condition asks for prime numbers strictly between (10) and (30).
Step 2
Why this answer is correct
(11,13,17,19,23,29) ही ऐसी संख्याएँ हैं जिनके केवल दो गुणनखंड हैं। / The required primes are (11,13,17,19,23,29).
Step 3
Exam Tip
परीक्षा में सीमा चिह्न ध्यान से देखें क्योंकि (10<x<30) में (10) और (30) शामिल नहीं होते। / In exams, check strict inequalities carefully because endpoints are not included.
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\(समुच्चय (B={x:x\in \mathbb{N}\) और \(x^2<50}) का सूची रूप क्या है\)?
\(What is the roster form of (B={x:x\in \mathbb{N}\) and \(x^2<50})\)?
#sets
#roster
#natural-numbers
#inequality
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A \(B=\{1,2,3,4,5,6,7\}\)
B \(B=\{0,1,2,3,4,5,6,7\}\)
C \(B=\{1,2,3,4,5,6\}\)
D \(B=\{1,2,3,4,5,6,7,8\}\)
Explanation opens after your attempt
Correct Answer
A. \(B=\{1,2,3,4,5,6,7\}\)
Step 1
Concept
(x) प्राकृत संख्या है और \(x^2<50\) होना चाहिए। / (x) is a natural number and must satisfy \(x^2<50\).
Step 2
Why this answer is correct
\(7^2=49\) सही है लेकिन \(8^2=64\) सही नहीं है। / \(7^2=49\) works but \(8^2=64\) does not.
Step 3
Exam Tip
वर्ग वाली शर्तों में अंतिम मान को जाँचकर ही सूची पूरी करें। / For square conditions, always test the boundary value before finalizing the roster form.
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समुच्चय \(C=\{2,4,6,8,10,12\}\) का सबसे उपयुक्त नियम रूप कौन सा है?
Which is the most suitable set-builder form of \(C=\{2,4,6,8,10,12\}\)?
#sets
#set-builder
#even-numbers
#representation
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A \((C={x:x\) सम प्राकृत संख्या है और \(2\le x\le 12})\) / \((C={x:x\) is an even natural number and \(2\le x\le 12})\)
B \((C={x:x\) विषम प्राकृत संख्या है और \(2\le x\le 12})\) / \((C={x:x\) is an odd natural number and \(2\le x\le 12})\)
C \((C={x:x\) अभाज्य संख्या है और \(2\le x\le 12})\) / \((C={x:x\) is a prime number and \(2\le x\le 12})\)
D \((C={x:x\) प्राकृत संख्या है और \(x<12})\) / \((C={x:x\) is a natural number and \(x<12})\)
Explanation opens after your attempt
Correct Answer
A. \((C={x:x\) सम प्राकृत संख्या है और \(2\le x\le 12})\) / \((C={x:x\) is an even natural number and \(2\le x\le 12})\)
Step 1
Concept
सूची में सभी संख्याएँ सम हैं। / Every element in the list is even.
Step 2
Why this answer is correct
सबसे छोटा पद (2) और सबसे बड़ा पद (12) है इसलिए सीमा \(2\le x\le 12\) होगी। / The smallest element is (2) and the largest is (12), so the range is \(2\le x\le 12\).
Step 3
Exam Tip
नियम रूप में केवल सीमा नहीं बल्कि सदस्य का प्रकार भी स्पष्ट लिखें। / A good set-builder form states both the property and the boundary.
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\(यदि (D={x:x\) महीनों के नामों का पहला अक्षर है}) माना जाए, तो यह समुच्चय किस प्रकार का है?
\(If (D={x:x\) is the first letter of the names of months}), what type of set is it?
#sets
#finite-set
#real-life-set
#representation
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A परिमित समुच्चय / Finite set
B अपरिमित समुच्चय / Infinite set
C रिक्त समुच्चय / Empty set
D एकल समुच्चय / Singleton set
Explanation opens after your attempt
Correct Answer
A. परिमित समुच्चय / Finite set
Step 1
Concept
महीनों की संख्या निश्चित होती है। / The number of months is fixed.
Step 2
Why this answer is correct
उनके पहले अक्षरों की संख्या भी सीमित रहेगी, चाहे कुछ अक्षर दोहराएँ। / Their first letters also form a limited collection even if some repeat before forming a set.
Step 3
Exam Tip
किसी वास्तविक जीवन सूची में गिनती समाप्त हो जाए तो उसे परिमित समुच्चय मानें। / If counting ends after a finite number of elements, the set is finite.
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\(समुच्चय (E={x:x\in \mathbb{Z}\) और \(x^2=9}) को सूची रूप में लिखिए\)।
\(Write (E={x:x\in \mathbb{Z}\) and \(x^2=9}) in roster form.\)
#sets
#integers
#roster
#square-equation
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A \(E=\{-3,3\}\)
B \(E=\{3\}\)
C \(E=\{-9,9\}\)
D \(E=\{-3,0,3\}\)
Explanation opens after your attempt
Correct Answer
A. \(E=\{-3,3\}\)
Step 1
Concept
पूर्णांक (x) के लिए \(x^2=9\) है। / (x) is an integer and satisfies \(x^2=9\).
Step 2
Why this answer is correct
\(3^2=9\) और ((-3)2 =9), इसलिए दोनों सदस्य होंगे। / Both \(3^2=9\) and ((-3)2 =9), so both values are included.
Step 3
Exam Tip
वर्ग समीकरण में ऋणात्मक हल भूलना परीक्षा में सामान्य गलती है। / In square equations, do not forget the negative solution.
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\(समुच्चय (F={x:x\in \mathbb{N}\) और \(5<x<6}) के बारे में सही कथन कौन सा है\)?
\(Which statement is correct about (F={x:x\in \mathbb{N}\) and \(5<x<6})\)?
#sets
#empty-set
#natural-numbers
#inequality
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A \(F=\varnothing\)
B \(F=\{5\}\)
C \(F=\{6\}\)
D \(F=\{5,6\}\)
Explanation opens after your attempt
Correct Answer
A. \(F=\varnothing\)
Step 1
Concept
(x) प्राकृत संख्या होनी चाहिए और (5) से बड़ी तथा (6) से छोटी होनी चाहिए। / (x) must be a natural number greater than (5) and less than (6).
Step 2
Why this answer is correct
(5) और (6) के बीच कोई प्राकृत संख्या नहीं आती। / No natural number lies between (5) and (6).
Step 3
Exam Tip
खुली सीमा में किनारे के मान शामिल नहीं होते, इसलिए जल्दी में (5) या (6) न लिखें। / With strict inequalities, endpoints are excluded.
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यदि \(G=\{a,b,c\}\) और \(H=\{c,a,b,a\}\), तो (G) और (H) के बारे में सही कथन कौन सा है?
If \(G=\{a,b,c\}\) and \(H=\{c,a,b,a\}\), which statement is correct about (G) and (H)?
#sets
#equal-sets
#roster
#repetition
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A (G=H)
B \(G\ne H\) क्योंकि क्रम अलग है / \(G\ne H\) because the order is different
C \(G\ne H\) क्योंकि (a) दो बार है / \(G\ne H\) because (a) appears twice
D (H) में (4) सदस्य हैं / (H) has (4) elements
Explanation opens after your attempt
Step 1
Concept
समुच्चय में क्रम का महत्व नहीं होता। / In a set, order does not matter.
Step 2
Why this answer is correct
दोहराया गया सदस्य केवल एक बार माना जाता है, इसलिए दोनों में (a,b,c) ही हैं। / Repeated elements are counted only once, so both sets contain (a,b,c).
Step 3
Exam Tip
सूची रूप पढ़ते समय दोहराव और क्रम को हटाकर वास्तविक सदस्यों की तुलना करें। / While comparing sets, ignore repetition and order.
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\(समुच्चय (I={x:x\) अंग्रेज़ी वर्णमाला का स्वर है}) का सूची रूप कौन सा है?
\(Which is the roster form of (I={x:x\) is a vowel of the English alphabet})?
#sets
#roster
#vowels
#representation
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A \(I=\{a,e,i,o,u\}\)
B \(I=\{a,b,c,d,e\}\)
C \(I=\{e,i,o,u,y\}\)
D \(I=\{a,e,i,o\}\)
Explanation opens after your attempt
Correct Answer
A. \(I=\{a,e,i,o,u\}\)
Step 1
Concept
यहाँ अंग्रेज़ी वर्णमाला के स्वरों का समुच्चय चाहिए। / The set asks for vowels of the English alphabet.
Step 2
Why this answer is correct
सामान्य रूप से स्वर (a,e,i,o,u) माने जाते हैं। / The standard vowels are (a,e,i,o,u).
Step 3
Exam Tip
परिभाषा आधारित प्रश्नों में प्रचलित पाठ्य नियम के अनुसार ही सदस्य चुनें। / For definition-based questions, choose elements according to the standard school convention.
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समुच्चय \(J={x:x=2n+1,\ n\in \mathbb{N},\ n<5}\) का सूची रूप क्या है?
What is the roster form of \(J={x:x=2n+1,\ n\in \mathbb{N},\ n<5}\)?
#sets
#set-builder
#roster
#odd-numbers
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A \(J=\{3,5,7,9\}\)
B \(J=\{1,3,5,7,9\}\)
C \(J=\{2,4,6,8\}\)
D \(J=\{3,5,7,9,11\}\)
Explanation opens after your attempt
Correct Answer
A. \(J=\{3,5,7,9\}\)
Step 1
Concept
\(n\in \mathbb{N}\) और (n<5), इसलिए (n=1,2,3,4)। / Since \(n\in \mathbb{N}\) and (n<5), (n=1,2,3,4).
Step 2
Why this answer is correct
(x=2n+1) रखने पर (3,5,7,9) मिलते हैं। / Substituting in (x=2n+1) gives (3,5,7,9).
Step 3
Exam Tip
चर किससे शुरू हो रहा है, यह हमेशा जाँचें क्योंकि यहाँ (n=0) नहीं लिया गया। / Always check where the parameter starts; here (n=0) is not included.
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\(यदि (K={x:x\in \mathbb{W}\) और \(x<4}), जहाँ (\mathbb{W}) पूर्ण संख्याओं का समुच्चय है, तो (K) क्या होगा\)?
\(If (K={x:x\in \mathbb{W}\) and \(x<4}), where (\mathbb{W}) is the set of whole numbers, what is (K)\)?
#sets
#whole-numbers
#roster
#inequality
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A \(K=\{0,1,2,3\}\)
B \(K=\{1,2,3\}\)
C \(K=\{0,1,2,3,4\}\)
D \(K=\{-1,0,1,2,3\}\)
Explanation opens after your attempt
Correct Answer
A. \(K=\{0,1,2,3\}\)
Step 1
Concept
पूर्ण संख्याएँ (0) से शुरू होती हैं। / Whole numbers start from (0).
Step 2
Why this answer is correct
(x<4) होने पर (0,1,2,3) ही लिए जाएँगे। / With (x<4), the possible values are (0,1,2,3).
Step 3
Exam Tip
प्राकृत और पूर्ण संख्याओं का अंतर याद रखना ऐसे प्रश्नों में बहुत जरूरी है। / Remember the difference between natural and whole numbers in representation questions.
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समुच्चय \(L=\{1,4,9,16,25\}\) का नियम रूप सबसे सही कौन सा है?
Which is the most accurate set-builder form of \(L=\{1,4,9,16,25\}\)?
#sets
#set-builder
#square-numbers
#pattern
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A \(L={x:x=n^2,\ n\in \mathbb{N},\ 1\le n\le 5}\)
B \(L={x:x=2n,\ n\in \mathbb{N},\ 1\le n\le 5}\)
C \(L={x:x=n^3,\ n\in \mathbb{N},\ 1\le n\le 5}\)
D \(L={x:x\in \mathbb{N},\ x<25}\)
Explanation opens after your attempt
Correct Answer
A. \(L={x:x=n^2,\ n\in \mathbb{N},\ 1\le n\le 5}\)
Step 1
Concept
दिए गए सदस्य (1,4,9,16,25) वर्ग संख्याएँ हैं। / The elements (1,4,9,16,25) are square numbers.
Step 2
Why this answer is correct
ये \(1^2,2^2,3^2,4^2,5^2\) से बनते हैं। / They are \(1^2,2^2,3^2,4^2,5^2\).
Step 3
Exam Tip
पैटर्न पहचानते समय केवल पहले और अंतिम पद पर नहीं, बीच के पदों पर भी ध्यान दें। / When identifying a pattern, verify all middle terms also fit it.
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\(समुच्चय (M={x:x\in \mathbb{Z}\) और \(-2\le x<3}) का सूची रूप कौन सा है\)?
\(Which is the roster form of (M={x:x\in \mathbb{Z}\) and \(-2\le x<3})\)?
#sets
#integers
#roster
#interval-condition
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A \(M=\{-2,-1,0,1,2\}\)
B \(M=\{-1,0,1,2,3\}\)
C \(M=\{-2,-1,1,2\}\)
D \(M=\{-2,-1,0,1,2,3\}\)
Explanation opens after your attempt
Correct Answer
A. \(M=\{-2,-1,0,1,2\}\)
Step 1
Concept
(x) पूर्णांक है, इसलिए ऋणात्मक संख्या, शून्य और धनात्मक संख्या आ सकती हैं। / (x) is an integer, so negative values, zero, and positive values are possible.
Step 2
Why this answer is correct
\(-2\le x\) में (-2) शामिल है, लेकिन (x<3) में (3) शामिल नहीं है। / \(-2\le x\) includes (-2), but (x<3) excludes (3).
Step 3
Exam Tip
बंद और खुली सीमाओं को अलग-अलग पढ़ें। / Read inclusive and exclusive bounds separately.
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\(यदि (N={x:x\) ऐसा त्रिभुज है जिसके चार भुजाएँ हैं}), तो (N) कैसा समुच्चय है?
\(If (N={x:x\) is a triangle having four sides}), what kind of set is (N)?
#sets
#empty-set
#definition
#representation
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A रिक्त समुच्चय / Empty set
B परिमित समुच्चय / Finite set with one element
C अपरिमित समुच्चय / Infinite set
D सार्वत्रिक समुच्चय / Universal set
Explanation opens after your attempt
Correct Answer
A. रिक्त समुच्चय / Empty set
Step 1
Concept
त्रिभुज की तीन भुजाएँ होती हैं। / A triangle has three sides.
Step 2
Why this answer is correct
चार भुजाओं वाला त्रिभुज संभव नहीं है, इसलिए कोई सदस्य नहीं मिलेगा। / A triangle with four sides is impossible, so there is no element.
Step 3
Exam Tip
असंभव शर्त दिखे तो समुच्चय को रिक्त समुच्चय मानें। / When a condition cannot be satisfied, the set is empty.
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\(समुच्चय (P={x:x\in \mathbb{N}\) और x संख्या 24 का भाजक है}) का सूची रूप क्या है?
\(What is the roster form of (P={x:x\in \mathbb{N}\) and x is a divisor of 24})?
#sets
#divisors
#roster
#natural-numbers
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A \(P=\{1,2,3,4,6,8,12,24\}\)
B \(P=\{2,3,4,6,8,12\}\)
C \(P=\{1,2,3,4,5,6,8,12,24\}\)
D \(P=\{1,2,4,8,16,24\}\)
Explanation opens after your attempt
Correct Answer
A. \(P=\{1,2,3,4,6,8,12,24\}\)
Step 1
Concept
(24) के सभी प्राकृत भाजक लिखने हैं। / We need all natural divisors of (24).
Step 2
Why this answer is correct
(1,2,3,4,6,8,12,24) से (24) पूरा-पूरा विभाजित होता है। / (1,2,3,4,6,8,12,24) divide (24) exactly.
Step 3
Exam Tip
भाजक लिखते समय (1) और स्वयं संख्या को कभी न भूलें। / While listing divisors, remember to include (1) and the number itself.
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\(यदि (Q={x:x\) एक अंक है और x अभाज्य है}), तो (Q) का सूची रूप कौन सा है?
\(If (Q={x:x\) is a digit and x is prime}), which is the roster form of (Q)?
#sets
#prime-digits
#roster
#classification
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A \(Q=\{2,3,5,7\}\)
B \(Q=\{1,2,3,5,7\}\)
C \(Q=\{2,3,5,7,9\}\)
D \(Q=\{0,2,3,5,7\}\)
Explanation opens after your attempt
Correct Answer
A. \(Q=\{2,3,5,7\}\)
Step 1
Concept
अंक (0) से (9) तक होते हैं। / Digits are from (0) to (9).
Step 2
Why this answer is correct
इनमें अभाज्य अंक (2,3,5,7) हैं, जबकि (1) अभाज्य नहीं है। / The prime digits are (2,3,5,7), while (1) is not prime.
Step 3
Exam Tip
अभाज्य संख्या के लिए ठीक दो धनात्मक गुणनखंड होने चाहिए। / A prime number has exactly two positive factors.
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समुच्चय \(R={x:x=3n,\ n\in \mathbb{N},\ 2\le n\le 6}\) का सूची रूप चुनिए।
Choose the roster form of \(R={x:x=3n,\ n\in \mathbb{N},\ 2\le n\le 6}\).
#sets
#roster
#multiples
#set-builder
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A \(R=\{6,9,12,15,18\}\)
B \(R=\{3,6,9,12,15,18\}\)
C \(R=\{2,3,4,5,6\}\)
D \(R=\{6,9,12,15\}\)
Explanation opens after your attempt
Correct Answer
A. \(R=\{6,9,12,15,18\}\)
Step 1
Concept
(n) के मान (2,3,4,5,6) हैं। / The possible values of (n) are (2,3,4,5,6).
Step 2
Why this answer is correct
(3n) करने पर (6,9,12,15,18) मिलते हैं। / Multiplying each by (3) gives (6,9,12,15,18).
Step 3
Exam Tip
नियम रूप में दिए गए सहायक चर की सीमा को पहले लिख लेना गलती कम करता है। / First list the parameter values to avoid missing an endpoint.
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\(समुच्चय (S={x:x\in \mathbb{N}\) और \(x+4=4}) का सही रूप क्या है\)?
\(What is the correct form of (S={x:x\in \mathbb{N}\) and \(x+4=4})\)?
#sets
#empty-set
#natural-numbers
#equation
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A \(S=\varnothing\)
B \(S=\{0\}\)
C \(S=\{4\}\)
D \(S=\{8\}\)
Explanation opens after your attempt
Correct Answer
A. \(S=\varnothing\)
Step 1
Concept
(x+4=4) से (x=0) मिलता है। / From (x+4=4), we get (x=0).
Step 2
Why this answer is correct
यहाँ \(x\in \mathbb{N}\) है और इस पाठ्य परंपरा में प्राकृत संख्याएँ (1) से शुरू मानी जाती हैं। / Here \(x\in \mathbb{N}\), and in the usual school convention natural numbers start from (1).
Step 3
Exam Tip
हल निकालने के बाद यह जरूर देखें कि हल दिए गए संख्या-समुच्चय में आता है या नहीं। / After solving, always check whether the value belongs to the given number set.
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\(यदि (T={x:x\) दो अंकों की संख्या है और दोनों अंक समान हैं}), तो (T) का सूची रूप क्या है?
\(If (T={x:x\) is a two-digit number whose digits are equal}), what is the roster form of (T)?
#sets
#roster
#two-digit-numbers
#pattern
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A \(T=\{11,22,33,44,55,66,77,88,99\}\)
B \(T=\{10,20,30,40,50,60,70,80,90\}\)
C \(T=\{12,23,34,45,56,67,78,89\}\)
D \(T=\{1,11,22,33,44,55,66,77,88,99\}\)
Explanation opens after your attempt
Correct Answer
A. \(T=\{11,22,33,44,55,66,77,88,99\}\)
Step 1
Concept
संख्या दो अंकों की होनी चाहिए। / The number must have two digits.
Step 2
Why this answer is correct
दोनों अंक समान हों तो (11,22,33,44,55,66,77,88,99) मिलते हैं। / Equal digits give (11,22,33,44,55,66,77,88,99).
Step 3
Exam Tip
दो अंकों की शर्त के कारण (1) जैसे एक अंकीय मान शामिल नहीं होंगे। / Because the condition says two-digit, one-digit values such as (1) are excluded.
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\(समुच्चय (U={x:x\in \mathbb{Z}\) और \(x^2-5x+6=0}) का सूची रूप कौन सा है\)?
\(Which is the roster form of (U={x:x\in \mathbb{Z}\) and \(x^2-5x+6=0})\)?
#sets
#quadratic-equation
#roster
#integers
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A \(U=\{2,3\}\)
B \(U=\{-2,-3\}\)
C \(U=\{1,6\}\)
D \(U=\{0,2,3\}\)
Explanation opens after your attempt
Correct Answer
A. \(U=\{2,3\}\)
Step 1
Concept
समीकरण \(x^2-5x+6=0\) को गुणनखंडों में लिखें। / Factorize \(x^2-5x+6=0\).
Step 2
Why this answer is correct
((x-2)(x-3)=0), इसलिए (x=2) या (x=3)। / ((x-2)(x-3)=0), so (x=2) or (x=3).
Step 3
Exam Tip
समीकरण आधारित समुच्चय में सभी मान लिखें जो शर्त को पूरा करते हैं। / In equation-based sets, list every value satisfying the condition.
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\(समुच्चय (V={x:x\) सप्ताह के उन दिनों का नाम है जो सोमवार से पहले आते हैं}) के बारे में सही कथन कौन सा है?
\(Which statement is correct about (V={x:x\) is the name of a day of the week that comes before Monday})?
#sets
#real-life-set
#context
#representation
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A \(संदर्भ में सप्ताह रविवार से शुरू मानने पर (V={\)Sunday}) / \(If the week is taken to start on Sunday, (V={\)Sunday})
B \(V=\varnothing\) सदा होगा / \(V=\varnothing\) always
C (V) अपरिमित होगा / (V) will be infinite
D (V) में सभी सप्ताह के दिन होंगे / (V) contains all days of the week
Explanation opens after your attempt
Correct Answer
A. \(संदर्भ में सप्ताह रविवार से शुरू मानने पर (V={\)Sunday}) / \(If the week is taken to start on Sunday, (V={\)Sunday})
Step 1
Concept
ऐसे प्रश्न में संदर्भ बहुत महत्वपूर्ण होता है। / Context is important in such real-life sets.
Step 2
Why this answer is correct
यदि सप्ताह रविवार से शुरू माना जाए, तो सोमवार से पहले रविवार आता है। / If the week is considered to start on Sunday, the day before Monday in that order is Sunday.
Step 3
Exam Tip
दैनिक जीवन के समुच्चयों में छिपी हुई परंपरा या संदर्भ को ध्यान से पढ़ें। / For real-life sets, read the implied convention carefully.
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\(यदि (W={x:x\in \mathbb{N}\) और x संख्या 36 तथा 48 दोनों का सामान्य भाजक है}), तो (W) क्या है?
\(If (W={x:x\in \mathbb{N}\) and x is a common divisor of 36 and 48}), what is (W)?
#sets
#common-divisors
#roster
#number-system
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A \(W=\{1,2,3,4,6,12\}\)
B \(W=\{1,2,3,4,6,8,12\}\)
C \(W=\{2,3,4,6,12,24\}\)
D \(W=\{1,2,4,6,9,12\}\)
Explanation opens after your attempt
Correct Answer
A. \(W=\{1,2,3,4,6,12\}\)
Step 1
Concept
(36) और (48) के सामान्य भाजक चाहिए। / We need common divisors of (36) and (48).
Step 2
Why this answer is correct
दोनों को पूरा-पूरा विभाजित करने वाले मान (1,2,3,4,6,12) हैं। / The values dividing both exactly are (1,2,3,4,6,12).
Step 3
Exam Tip
सामान्य भाजक में वह संख्या ही लिखें जो दोनों संख्याओं को विभाजित करे, केवल एक को नहीं। / A common divisor must divide both numbers, not just one.
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\(समुच्चय (X={x:x\in \mathbb{N}\) और \(x\le 10,\ x\) न तो अभाज्य है न भाज्य}) का सूची रूप क्या है?
\(What is the roster form of (X={x:x\in \mathbb{N}\) and \(x\le 10,\ x\) is neither prime nor composite})?
#sets
#prime-composite
#singleton-set
#roster
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A \(X=\{1\}\)
B \(X=\{0,1\}\)
C \(X=\{2\}\)
D \(X=\varnothing\)
Explanation opens after your attempt
Correct Answer
A. \(X=\{1\}\)
Step 1
Concept
(10) तक की प्राकृत संख्याओं में (1) न अभाज्य है न भाज्य। / Among natural numbers up to (10), (1) is neither prime nor composite.
Step 2
Why this answer is correct
(2,3,5,7) अभाज्य हैं और (4,6,8,9,10) भाज्य हैं। / (2,3,5,7) are prime and (4,6,8,9,10) are composite.
Step 3
Exam Tip
(1) की विशेष स्थिति याद रखें, यह अभाज्य नहीं माना जाता। / Remember the special status of (1); it is not prime.
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\(समुच्चय (Y={x:x\) शब्द level में आने वाले अलग-अलग अक्षर हैं}) का सूची रूप कौन सा है?
\(Which is the roster form of (Y={x:x\) is a distinct letter occurring in the word level})?
#sets
#letters
#roster
#repetition
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A \(Y=\{l,e,v\}\)
B \(Y=\{l,e,v,e,l\}\)
C \(Y=\{e,l\}\)
D \(Y=\{l,v\}\)
Explanation opens after your attempt
Correct Answer
A. \(Y=\{l,e,v\}\)
Step 1
Concept
समुच्चय में अलग-अलग सदस्य ही लिखे जाते हैं। / A set contains distinct elements only.
Step 2
Why this answer is correct
शब्द में (l) और (e) दोहरते हैं, पर समुच्चय में वे एक बार आएँगे। / The letters (l) and (e) repeat in the word, but appear once in the set.
Step 3
Exam Tip
अक्षरों के समुच्चय बनाते समय दोहराए गए अक्षर हटाएँ। / While forming a set from letters, remove repeated letters.
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\(यदि (Z={x:x\in \mathbb{N}\) और \(2x+1<12}), तो (Z) का सूची रूप क्या है\)?
\(If (Z={x:x\in \mathbb{N}\) and \(2x+1<12}), what is the roster form of (Z)\)?
#sets
#inequality
#roster
#natural-numbers
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A \(Z=\{1,2,3,4,5\}\)
B \(Z=\{0,1,2,3,4,5\}\)
C \(Z=\{1,2,3,4,5,6\}\)
D \(Z=\{2,3,4,5\}\)
Explanation opens after your attempt
Correct Answer
A. \(Z=\{1,2,3,4,5\}\)
Step 1
Concept
(2x+1<12) से (2x<11), इसलिए \(x<\frac{11}{2}\)। / From (2x+1<12), we get (2x<11), so \(x<\frac{11}{2}\).
Step 2
Why this answer is correct
प्राकृत संख्याओं में (1,2,3,4,5) इस शर्त को पूरा करते हैं। / The natural numbers satisfying this are (1,2,3,4,5).
Step 3
Exam Tip
असमानता हल करने के बाद दिए गए संख्या-समुच्चय के अनुसार ही उत्तर लिखें। / After solving an inequality, list values according to the given number set.
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\(समुच्चय (A_1={x:x\in \mathbb{Z}\) और \(|x|<3}) का सूची रूप कौन सा है\)?
\(Which is the roster form of (A_1={x:x\in \mathbb{Z}\) and \(|x|<3})\)?
#sets
#absolute-value
#integers
#roster
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A \(A_1={-2,-1,0,1,2}\)
B \(A_1={-3,-2,-1,0,1,2,3}\)
C \(A_1={-3,-2,-1,0,1,2}\)
D \(A_1={0,1,2}\)
Explanation opens after your attempt
Correct Answer
A. \(A_1={-2,-1,0,1,2}\)
Step 1
Concept
(|x|<3) का अर्थ है (x) शून्य से दूरी में (3) से कम हो।
Step 2
Why this answer is correct
पूर्णांकों में (-2,-1,0,1,2) ही इस शर्त को पूरा करते हैं। / The integers satisfying it are (-2,-1,0,1,2).
Step 3
Exam Tip
परम मान में धनात्मक और ऋणात्मक दोनों पक्ष जाँचें। / In absolute value conditions, check both positive and negative sides.
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समुच्चय \(B_1={3,6,9,12,\ldots}\) का सही नियम रूप कौन सा है?
Which is the correct set-builder form of \(B_1={3,6,9,12,\ldots}\)?
#sets
#set-builder
#infinite-set
#multiples
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A \(B_1={x:x=3n,\ n\in \mathbb{N}}\)
B \(B_1={x:x=n+3,\ n\in \mathbb{N}}\)
C \(B_1={x:x=2n+1,\ n\in \mathbb{N}}\)
D \(B_1={x:x=3n,\ n\in \mathbb{Z}}\)
Explanation opens after your attempt
Correct Answer
A. \(B_1={x:x=3n,\ n\in \mathbb{N}}\)
Step 1
Concept
सूची में (3) के धनात्मक गुणज हैं। / The list contains positive multiples of (3).
Step 2
Why this answer is correct
\(n\in \mathbb{N}\) लेने पर (3n) से \(3,6,9,12,\ldots\) मिलते हैं। / Taking \(n\in \mathbb{N}\), (3n) gives \(3,6,9,12,\ldots\).
Step 3
Exam Tip
अनंत सूची में बिंदुओं को देखकर पैटर्न और प्रारंभिक मान दोनों पहचानें। / For infinite lists, identify both the pattern and the starting value.
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\(यदि (C_1={x:x\) संख्या 15 से छोटी धनात्मक सम भाज्य संख्या है\(}), तो (C_1) क्या होगा\)?
\(If (C_1={x:x\) is a positive even composite number less than \(15}), what is (C_1)\)?
#sets
#composite-numbers
#even-numbers
#roster
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A \(C_1={4,6,8,10,12,14}\)
B \(C_1={2,4,6,8,10,12,14}\)
C \(C_1={6,8,10,12,14}\)
D \(C_1={4,6,8,10,12}\)
Explanation opens after your attempt
Correct Answer
A. \(C_1={4,6,8,10,12,14}\)
Step 1
Concept
धनात्मक सम संख्याएँ (2,4,6,8,10,12,14) हैं। / Positive even numbers less than (15) are (2,4,6,8,10,12,14).
Step 2
Why this answer is correct
(2) अभाज्य है, भाज्य नहीं; इसलिए उसे हटाएँ। / (2) is prime, not composite, so it is removed.
Step 3
Exam Tip
जब दो गुण एक साथ दिए हों, तो दोनों शर्तें साथ-साथ लागू करें। / When two properties are given, apply both together.
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\(समुच्चय (D_1={x:x\in \mathbb{N}\) और x का दहाई अंक 2 है तथा \(x<30}) का सूची रूप क्या है\)?
\(What is the roster form of (D_1={x:x\in \mathbb{N}\) and the tens digit of x is 2 and \(x<30})\)?
#sets
#roster
#digits
#place-value
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A \(D_1={20,21,22,23,24,25,26,27,28,29}\)
B \(D_1={21,22,23,24,25,26,27,28,29}\)
C \(D_1={2,12,22}\)
D \(D_1={20,22,24,26,28}\)
Explanation opens after your attempt
Correct Answer
A. \(D_1={20,21,22,23,24,25,26,27,28,29}\)
Step 1
Concept
दहाई अंक (2) होने का मतलब संख्या (20) से (29) के बीच है। / Tens digit (2) means the number lies from (20) to (29).
Step 2
Why this answer is correct
(x<30) होने से (20) से (29) तक सभी मान मान्य हैं। / Since (x<30), all values from (20) to (29) are valid.
Step 3
Exam Tip
अंक-आधारित शर्तों में स्थानमान को ध्यान से समझें। / In digit-based conditions, understand place value carefully.
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\(यदि (E_1={x:x\in \mathbb{N}\) और \(x^2\le 100,\ x\) विषम है\(}), तो (E_1) कौन सा है\)?
\(If (E_1={x:x\in \mathbb{N}\) and \(x^2\le 100,\ x\) is odd\(}), which is (E_1)\)?
#sets
#odd-numbers
#square-inequality
#roster
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A \(E_1={1,3,5,7,9}\)
B \(E_1={1,3,5,7,9,11}\)
C \(E_1={0,1,3,5,7,9}\)
D \(E_1={1,2,3,4,5,6,7,8,9,10}\)
Explanation opens after your attempt
Correct Answer
A. \(E_1={1,3,5,7,9}\)
Step 1
Concept
\(x^2\le 100\) से प्राकृत \(x\le 10\) होगा। / From \(x^2\le 100\), natural \(x\le 10\).
Step 2
Why this answer is correct
(1) से (10) तक की विषम संख्याएँ (1,3,5,7,9) हैं। / Odd numbers from (1) to (10) are (1,3,5,7,9).
Step 3
Exam Tip
मिश्रित शर्तों में पहले सीमा निकालें और फिर विशेष गुण छाँटें। / In mixed conditions, first find the range, then filter by the property.
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\(समुच्चय (F_1={x:x\) संख्या 20 से कम 3 या 5 का धनात्मक गुणज है}) का सूची रूप कौन सा है?
\(Which is the roster form of (F_1={x:x\) is a positive multiple of 3 or 5 less than 20})?
#sets
#multiples
#or-condition
#roster
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? Hint Small clue
A \(F_1={3,5,6,9,10,12,15,18}\)
B \(F_1={3,5,6,9,10,12,15,18,20}\)
C \(F_1={3,6,9,12,15,18}\)
D \(F_1={5,10,15}\)
Explanation opens after your attempt
Correct Answer
A. \(F_1={3,5,6,9,10,12,15,18}\)
Step 1
Concept
(20) से कम (3) के गुणज (3,6,9,12,15,18) हैं। / Multiples of (3) less than (20) are (3,6,9,12,15,18).
Step 2
Why this answer is correct
(5) के गुणज (5,10,15) हैं; दोहराए गए (15) को एक बार रखें। / Multiples of (5) are (5,10,15); repeated (15) is written once.
Step 3
Exam Tip
या वाली शर्त में दोनों सूचियों का सम्मिलित समुच्चय बनता है। / An or condition forms the combined set of both lists.
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\(समुच्चय (G_1={x:x\in \mathbb{N}\) और x संख्या 18 का गुणज है तथा \(x<100}) का सही सूची रूप कौन सा है\)?
\(Which is the correct roster form of (G_1={x:x\in \mathbb{N}\) and x is a multiple of 18 with \(x<100})\)?
#sets
#multiples
#roster
#finite-set
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? Hint Small clue
A \(G_1={18,36,54,72,90}\)
B \(G_1={0,18,36,54,72,90}\)
C \(G_1={18,36,54,72,90,108}\)
D \(G_1={18,38,58,78,98}\)
Explanation opens after your attempt
Correct Answer
A. \(G_1={18,36,54,72,90}\)
Step 1
Concept
(18) के धनात्मक गुणज लिखें। / List the positive multiples of (18).
Step 2
Why this answer is correct
(18,36,54,72,90) (100) से कम हैं, जबकि (108) नहीं है। / (18,36,54,72,90) are less than (100), while (108) is not.
Step 3
Exam Tip
गुणजों की सूची बनाते समय अंतिम मान सीमा से बाहर न जाने दें। / When listing multiples, stop before crossing the given bound.
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\(यदि (H_1={x:x\in \mathbb{Z}\) और \(x^3=x}), तो (H_1) का सूची रूप क्या है\)?
\(If (H_1={x:x\in \mathbb{Z}\) and \(x^3=x}), what is the roster form of (H_1)\)?
#sets
#cubic-equation
#integers
#roster
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A \(H_1={-1,0,1}\)
B \(H_1={0,1}\)
C \(H_1={-1,1}\)
D \(H_1={-2,-1,0,1,2}\)
Explanation opens after your attempt
Correct Answer
A. \(H_1={-1,0,1}\)
Step 1
Concept
\(x^3=x\) से \(x^3-x=0\) मिलता है। / From \(x^3=x\), we get \(x^3-x=0\).
Step 2
Why this answer is correct
(x(x-1)(x+1)=0), इसलिए (x=-1,0,1)। / (x(x-1)(x+1)=0), so (x=-1,0,1).
Step 3
Exam Tip
नियम रूप में समीकरण हो तो गुणनखंड बनाकर सभी हल लिखें। / When a set is defined by an equation, factorize and list all solutions.
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\(समुच्चय (I_1={x:x\) संख्या 1 से 50 तक की पूर्ण वर्ग संख्या है}) का सूची रूप चुनिए।
\(Choose the roster form of (I_1={x:x\) is a perfect square number from 1 to 50}).
#sets
#perfect-squares
#roster
#number-pattern
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A \(I_1={1,4,9,16,25,36,49}\)
B \(I_1={1,4,9,16,25,36,49,64}\)
C \(I_1={4,9,16,25,36,49}\)
D \(I_1={1,8,27,64}\)
Explanation opens after your attempt
Correct Answer
A. \(I_1={1,4,9,16,25,36,49}\)
Step 1
Concept
(1) से (50) तक की वर्ग संख्याएँ चाहिए। / We need perfect squares from (1) to (50).
Step 2
Why this answer is correct
\(1^2\) से \(7^2\) तक (1,4,9,16,25,36,49) मिलते हैं और \(8^2=64\) बाहर है। / From \(1^2\) to \(7^2\), we get (1,4,9,16,25,36,49), and \(8^2=64\) is outside.
Step 3
Exam Tip
वर्ग संख्याओं में ऊपरी सीमा से आगे का वर्ग शामिल न करें। / Do not include a square beyond the upper limit.
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\(यदि (J_1={x:x\in \mathbb{N}\) और x का केवल एक धनात्मक भाजक है\(}), तो (J_1) क्या है\)?
\(If (J_1={x:x\in \mathbb{N}\) and x has exactly one positive divisor\(}), what is (J_1)\)?
#sets
#singleton-set
#divisors
#natural-numbers
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A \(J_1={1}\)
B \(J_1={0}\)
C \(J_1={2}\)
D \(J_1=\varnothing\)
Explanation opens after your attempt
Correct Answer
A. \(J_1={1}\)
Step 1
Concept
किसी प्राकृत संख्या का धनात्मक भाजक गिनना है। / We need to count positive divisors of a natural number.
Step 2
Why this answer is correct
(1) का केवल एक धनात्मक भाजक (1) ही है, जबकि (2) के दो भाजक हैं। / (1) has only one positive divisor, (1), while (2) has two.
Step 3
Exam Tip
भाजकों की संख्या से जुड़े प्रश्नों में (1) को अलग से जाँचें। / In divisor-count questions, check (1) separately.
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\(समुच्चय (K_1={x:x\in \mathbb{N}\) और x संख्या 7 से विभाज्य है तथा \(30<x<60}) का सूची रूप क्या है\)?
\(What is the roster form of (K_1={x:x\in \mathbb{N}\) and x is divisible by 7 with \(30<x<60})\)?
#sets
#divisibility
#roster
#inequality
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A \(K_1={35,42,49,56}\)
B \(K_1={28,35,42,49,56,63}\)
C \(K_1={35,42,49}\)
D \(K_1={30,35,42,49,56,60}\)
Explanation opens after your attempt
Correct Answer
A. \(K_1={35,42,49,56}\)
Step 1
Concept
(30) और (60) के बीच (7) से विभाज्य संख्याएँ खोजें। / Find numbers divisible by (7) between (30) and (60).
Step 2
Why this answer is correct
(35,42,49,56) ही इस खुली सीमा में आते हैं। / The values are (35,42,49,56) within the strict range.
Step 3
Exam Tip
विभाज्यता और सीमा दोनों शर्तें साथ-साथ जाँचें। / Check divisibility and boundary conditions together.
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\(यदि (L_1={x:x\in \mathbb{Z}\) और \(-5<x\le 1}), तो (L_1) का सूची रूप कौन सा है\)?
\(If (L_1={x:x\in \mathbb{Z}\) and \(-5<x\le 1}), which is the roster form of (L_1)\)?
#sets
#integers
#roster
#boundary-values
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A \(L_1={-4,-3,-2,-1,0,1}\)
B \(L_1={-5,-4,-3,-2,-1,0,1}\)
C \(L_1={-4,-3,-2,-1,0}\)
D \(L_1={-5,-4,-3,-2,-1,0}\)
Explanation opens after your attempt
Correct Answer
A. \(L_1={-4,-3,-2,-1,0,1}\)
Step 1
Concept
(-5<x) में (-5) शामिल नहीं है।
Step 2
Why this answer is correct
\(x\le 1\) में (1) शामिल है, इसलिए (-4) से (1) तक के पूर्णांक मिलेंगे। / \(x\le 1\) includes (1), so integers from (-4) to (1) are listed.
Step 3
Exam Tip
मिश्रित सीमा में बाएँ और दाएँ छोर अलग-अलग तय करें। / In mixed boundaries, decide each endpoint separately.
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\(समुच्चय (M_1={x:x\) संख्या 100 से कम 10 का धनात्मक गुणज है और x संख्या 25 से भी विभाज्य है}) क्या है?
\(What is (M_1={x:x\) is a positive multiple of 10 less than 100 and also divisible by 25})?
#sets
#and-condition
#multiples
#singleton-set
50 50-50 2 wrong hide
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? Hint Small clue
A \(M_1={50}\)
B \(M_1={25,50,75}\)
C \(M_1={10,20,30,40,50,60,70,80,90}\)
D \(M_1={50,100}\)
Explanation opens after your attempt
Correct Answer
A. \(M_1={50}\)
Step 1
Concept
(100) से कम (10) के गुणज \(10,20,\ldots,90\) हैं। / Positive multiples of (10) less than (100) are \(10,20,\ldots,90\).
Step 2
Why this answer is correct
इनमें (25) से विभाज्य केवल (50) है। / Among them, only (50) is divisible by (25).
Step 3
Exam Tip
और वाली शर्त में सभी शर्तें एक साथ पूरी होनी चाहिए। / An and condition requires every condition to be satisfied together.
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\(यदि (N_1={x:x\in \mathbb{N}\) और \(x=\frac{12}{n},\ n\in \mathbb{N}}), तो (N_1) का सूची रूप क्या है\)?
\(If (N_1={x:x\in \mathbb{N}\) and \(x=\frac{12}{n},\ n\in \mathbb{N}}), what is the roster form of (N_1)\)?
#sets
#divisors
#set-builder
#roster
50 50-50 2 wrong hide
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? Hint Small clue
A \(N_1={1,2,3,4,6,12}\)
B \(N_1={12,6,4,3,2,1}\)
C \(N_1={1,2,3,4,5,6,12}\)
D \(N_1={n:n\in \mathbb{N}}\)
Explanation opens after your attempt
Correct Answer
A. \(N_1={1,2,3,4,6,12}\)
Step 1
Concept
\(x=\frac{12}{n}\) प्राकृत होना चाहिए, इसलिए (n) को (12) का भाजक होना चाहिए। / \(x=\frac{12}{n}\) must be natural, so (n) must divide (12).
Step 2
Why this answer is correct
मिलने वाले (x) मान (12,6,4,3,2,1) हैं, जिन्हें समुच्चय में सामान्य क्रम से ({1,2,3,4,6,12}) लिख सकते हैं। / The possible (x)-values are (12,6,4,3,2,1), written as ({1,2,3,4,6,12}).
Step 3
Exam Tip
समुच्चय में क्रम महत्व नहीं रखता। / Order does not matter in a set.
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\(समुच्चय (O_1={x:x\) शब्द mathematics में आने वाले अलग-अलग अक्षर हैं}) में कितने सदस्य होंगे?
\(How many elements are in (O_1={x:x\) is a distinct letter occurring in the word mathematics})?
#sets
#cardinality
#letters
#repetition
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A (8)
B (11)
C (7)
D (9)
Explanation opens after your attempt
Step 1
Concept
शब्द के अलग-अलग अक्षर पहचानें। / Identify the distinct letters in the word.
Step 2
Why this answer is correct
(m,a,t,h,e,i,c,s) अलग-अलग अक्षर हैं, इसलिए कुल (8) सदस्य होंगे। / The distinct letters are (m,a,t,h,e,i,c,s), so there are (8) elements.
Step 3
Exam Tip
अक्षर गिनते समय दोहराए हुए अक्षरों को दोबारा न गिनें। / Do not count repeated letters again.
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\(यदि (P_1={x:x\in \mathbb{N}\) और \(x^2-10x+21=0}), तो (P_1) कौन सा है\)?
\(If (P_1={x:x\in \mathbb{N}\) and \(x^2-10x+21=0}), which is (P_1)\)?
#sets
#quadratic-equation
#natural-numbers
#roster
50 50-50 2 wrong hide
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? Hint Small clue
A \(P_1={3,7}\)
B \(P_1={-3,-7}\)
C \(P_1={1,21}\)
D \(P_1={0,3,7}\)
Explanation opens after your attempt
Correct Answer
A. \(P_1={3,7}\)
Step 1
Concept
समीकरण \(x^2-10x+21=0\) को गुणनखंड करें। / Factorize \(x^2-10x+21=0\).
Step 2
Why this answer is correct
((x-3)(x-7)=0), इसलिए (x=3,7)। / ((x-3)(x-7)=0), so (x=3,7).
Step 3
Exam Tip
हल मिलने के बाद देखें कि वे प्राकृत संख्याएँ हैं या नहीं। / After finding solutions, check that they are natural numbers.
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\(समुच्चय (Q_1={x:x\in \mathbb{Z}\) और \(x^2<10,\ x\) सम है}) का सूची रूप क्या होगा?
\(What will be the roster form of (Q_1={x:x\in \mathbb{Z}\) and \(x^2<10,\ x\) is even})?
#sets
#integers
#even-numbers
#square-inequality
50 50-50 2 wrong hide
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? Hint Small clue
A \(Q_1={-2,0,2}\)
B \(Q_1={-4,-2,0,2,4}\)
C \(Q_1={0,2}\)
D \(Q_1={-3,-2,-1,0,1,2,3}\)
Explanation opens after your attempt
Correct Answer
A. \(Q_1={-2,0,2}\)
Step 1
Concept
\(x^2<10\) के लिए पूर्णांक (x=-3,-2,-1,0,1,2,3) हो सकते हैं। / For \(x^2<10\), possible integers are (-3,-2,-1,0,1,2,3).
Step 2
Why this answer is correct
इनमें सम पूर्णांक (-2,0,2) हैं। / The even integers among them are (-2,0,2).
Step 3
Exam Tip
पहले सीमा से संभावित सदस्य लिखें, फिर सम या विषम जैसी शर्त लगाएँ। / First list possible values by range, then apply even or odd condition.
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\(यदि (R_1={x:x\) दो अंकों की अभाज्य संख्या है और \(x<20}), तो (R_1) का सूची रूप कौन सा है\)?
\(If (R_1={x:x\) is a two-digit prime number and \(x<20}), which is the roster form of (R_1)\)?
#sets
#prime-numbers
#two-digit-numbers
#roster
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A \(R_1={11,13,17,19}\)
B \(R_1={2,3,5,7,11,13,17,19}\)
C \(R_1={10,11,13,17,19}\)
D \(R_1={11,13,15,17,19}\)
Explanation opens after your attempt
Correct Answer
A. \(R_1={11,13,17,19}\)
Step 1
Concept
दो अंकों और (20) से कम होने के कारण संख्याएँ (10) से (19) तक देखें। / Since the number is two-digit and less than (20), check from (10) to (19).
Step 2
Why this answer is correct
इनमें अभाज्य संख्याएँ (11,13,17,19) हैं। / The prime numbers there are (11,13,17,19).
Step 3
Exam Tip
(1) से शुरू होने वाली सभी दो अंकीय संख्याएँ अभाज्य नहीं होतीं, इसलिए जाँच जरूरी है। / Not every two-digit number starting with (1) is prime, so test divisibility.
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\(समुच्चय (S_1={x:x\in \mathbb{N}\) और x संख्या 30 का भाजक है पर x सम नहीं है}) क्या है?
\(What is (S_1={x:x\in \mathbb{N}\) and x is a divisor of 30 but x is not even})?
#sets
#divisors
#odd-numbers
#roster
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A \(S_1={1,3,5,15}\)
B \(S_1={2,6,10,30}\)
C \(S_1={1,2,3,5,6,10,15,30}\)
D \(S_1={3,5,15,30}\)
Explanation opens after your attempt
Correct Answer
A. \(S_1={1,3,5,15}\)
Step 1
Concept
(30) के भाजक (1,2,3,5,6,10,15,30) हैं। / Divisors of (30) are (1,2,3,5,6,10,15,30).
Step 2
Why this answer is correct
सम भाजक हटाने पर (1,3,5,15) बचते हैं। / Removing even divisors leaves (1,3,5,15).
Step 3
Exam Tip
पर वाली शर्त में पहले मुख्य सूची बनाकर फिर हटाने वाली शर्त लागू करें। / For a but condition, first form the main list and then remove the excluded type.
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\(यदि (T_1={x:x\in \mathbb{N}\) और \(x<10,\ x\) तथा 10-x दोनों अभाज्य हैं\(}), तो (T_1) क्या होगा\)?
\(If (T_1={x:x\in \mathbb{N}\) and \(x<10,\ x\) and 10-x are both prime\(}), what is (T_1)\)?
#sets
#prime-numbers
#conditional-set
#roster
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? Hint Small clue
A \(T_1={3,5,7}\)
B \(T_1={2,3,5,7}\)
C \(T_1={1,3,5,7,9}\)
D \(T_1={5}\)
Explanation opens after your attempt
Correct Answer
A. \(T_1={3,5,7}\)
Step 1
Concept
(x) और (10-x) दोनों अभाज्य होने चाहिए। / Both (x) and (10-x) must be prime.
Step 2
Why this answer is correct
(x=3,5,7) पर क्रमशः (7,5,3) मिलते हैं, जो अभाज्य हैं। / For (x=3,5,7), the corresponding values (7,5,3) are prime.
Step 3
Exam Tip
दोहरी शर्त में हर चुने गए मान के साथ दूसरी अभिव्यक्ति भी जाँचें। / In double-condition sets, test the second expression for each candidate.
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\(समुच्चय (U_1={x:x\in \mathbb{N}\) और \(\frac{20}{x}\) भी प्राकृत संख्या है}) का सूची रूप कौन सा है?
\(Which is the roster form of (U_1={x:x\in \mathbb{N}\) and \(\frac{20}{x}\) is also a natural number})?
#sets
#divisors
#fraction-condition
#roster
50 50-50 2 wrong hide
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? Hint Small clue
A \(U_1={1,2,4,5,10,20}\)
B \(U_1={2,4,5,10}\)
C \(U_1={1,2,3,4,5,10,20}\)
D \(U_1={20,40,60,\ldots}\)
Explanation opens after your attempt
Correct Answer
A. \(U_1={1,2,4,5,10,20}\)
Step 1
Concept
\(\frac{20}{x}\) प्राकृत हो, इसके लिए (x) को (20) का भाजक होना चाहिए। / For \(\frac{20}{x}\) to be natural, (x) must divide (20).
Step 2
Why this answer is correct
(20) के प्राकृत भाजक (1,2,4,5,10,20) हैं। / The natural divisors of (20) are (1,2,4,5,10,20).
Step 3
Exam Tip
भिन्न वाली शर्त में हर को ऐसा चुनें कि भाग पूरा-पूरा हो। / In fraction-based conditions, choose denominators that divide exactly.
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\(यदि (V_1={x:x\) संख्या 1 से 30 तक की ऐसी संख्या है जिसके अंकों का योग 5 है\(}), तो (V_1) क्या है\)?
\(If (V_1={x:x\) is a number from 1 to 30 whose sum of digits is \(5}), what is (V_1)\)?
#sets
#digit-sum
#roster
#finite-set
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A \(V_1={5,14,23}\)
B \(V_1={5,15,25}\)
C \(V_1={14,23,32}\)
D \(V_1={5,14,23,30}\)
Explanation opens after your attempt
Correct Answer
A. \(V_1={5,14,23}\)
Step 1
Concept
(1) से (30) तक अंकों का योग (5) देखना है। / We check numbers from (1) to (30) whose digit sum is (5).
Step 2
Why this answer is correct
(5), (14) और (23) में अंकों का योग (5) है। / (5), (14), and (23) have digit sum (5).
Step 3
Exam Tip
अंकों के योग वाले प्रश्न में सीमा के बाहर की संख्या जैसे (32) न लें। / In digit-sum questions, do not include numbers outside the given range.
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\(समुच्चय (W_1={x:x\in \mathbb{Z}\) और \(x^2=2x}) का सूची रूप क्या है\)?
\(What is the roster form of (W_1={x:x\in \mathbb{Z}\) and \(x^2=2x})\)?
#sets
#equation
#integers
#roster
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A \(W_1={0,2}\)
B \(W_1={2}\)
C \(W_1={-2,0}\)
D \(W_1={0,1,2}\)
Explanation opens after your attempt
Correct Answer
A. \(W_1={0,2}\)
Step 1
Concept
\(x^2=2x\) को \(x^2-2x=0\) लिखें। / Rewrite \(x^2=2x\) as \(x^2-2x=0\).
Step 2
Why this answer is correct
(x(x-2)=0), इसलिए (x=0) या (x=2)। / (x(x-2)=0), so (x=0) or (x=2).
Step 3
Exam Tip
जब (x) दोनों पक्ष में हो, तो सीधे काटने से पहले (x=0) की संभावना जाँचें। / When (x) appears on both sides, avoid canceling without checking (x=0).
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\(यदि (X_1={x:x\in \mathbb{N}\) और x संख्या 42 का भाजक है तथा \(x>6}), तो (X_1) कौन सा है\)?
\(If (X_1={x:x\in \mathbb{N}\) and x is a divisor of 42 with \(x>6}), which is (X_1)\)?
#sets
#divisors
#inequality
#roster
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A \(X_1={7,14,21,42}\)
B \(X_1={1,2,3,6,7,14,21,42}\)
C \(X_1={6,7,14,21,42}\)
D \(X_1={7,14,21}\)
Explanation opens after your attempt
Correct Answer
A. \(X_1={7,14,21,42}\)
Step 1
Concept
(42) के भाजक (1,2,3,6,7,14,21,42) हैं। / Divisors of (42) are (1,2,3,6,7,14,21,42).
Step 2
Why this answer is correct
(x>6) होने से (7,14,21,42) बचते हैं। / With (x>6), the remaining values are (7,14,21,42).
Step 3
Exam Tip
सीमा लागू करते समय बराबर का चिह्न है या नहीं, यह अवश्य देखें। / While applying a boundary, check whether equality is allowed.
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\(समुच्चय (Y_1={x:x\) संख्या 1 से 20 तक है और x न 2 से विभाज्य है न 3 से}) का सूची रूप कौन सा है?
\(Which is the roster form of (Y_1={x:x\) is from 1 to 20 and x is divisible by neither 2 nor 3})?
#sets
#divisibility
#roster
#neither-condition
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A \(Y_1={1,5,7,11,13,17,19}\)
B \(Y_1={1,3,5,7,9,11,13,15,17,19}\)
C \(Y_1={2,4,6,8,10,12,14,16,18,20}\)
D \(Y_1={5,7,11,13,17,19}\)
Explanation opens after your attempt
Correct Answer
A. \(Y_1={1,5,7,11,13,17,19}\)
Step 1
Concept
(1) से (20) तक की संख्याओं में (2) या (3) से विभाज्य संख्याएँ हटाएँ। / From numbers (1) to (20), remove those divisible by (2) or by (3).
Step 2
Why this answer is correct
बची संख्याएँ (1,5,7,11,13,17,19) हैं। / The remaining numbers are (1,5,7,11,13,17,19).
Step 3
Exam Tip
न यह न वह वाली शर्त में दोनों प्रकार की संख्याएँ हटानी पड़ती हैं। / In a neither-nor condition, exclude both categories.
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\(यदि (Z_1={x:x\in \mathbb{N}\) और \(x^2+x=20}), तो (Z_1) का सही सूची रूप क्या है\)?
\(If (Z_1={x:x\in \mathbb{N}\) and \(x^2+x=20}), what is the correct roster form of (Z_1)\)?
#sets
#quadratic-equation
#natural-numbers
#roster
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A \(Z_1={4}\)
B \(Z_1={-5,4}\)
C \(Z_1={5}\)
D \(Z_1=\varnothing\)
Explanation opens after your attempt
Correct Answer
A. \(Z_1={4}\)
Step 1
Concept
\(x^2+x=20\) को \(x^2+x-20=0\) लिखें। / Rewrite \(x^2+x=20\) as \(x^2+x-20=0\).
Step 2
Why this answer is correct
((x+5)(x-4)=0), इसलिए हल (-5) और (4) हैं, पर प्राकृत संख्या केवल (4) है। / ((x+5)(x-4)=0), so the solutions are (-5) and (4), but only (4) is natural.
Step 3
Exam Tip
समीकरण के सभी हलों में से वही चुनें जो दिए गए समुच्चय की शर्त में आते हों। / From all equation solutions, keep only values allowed by the set condition.
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यदि \(A={x:x\in \mathbb{N},,x^2-7x+10=0}\), तो (A) का सूची रूप क्या होगा?
If \(A={x:x\in \mathbb{N},,x^2-7x+10=0}\), what is the roster form of (A)?
#sets
#set-builder
#roster
#quadratic
#natural numbers
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A \(A=\{1,10\}\)
B \(A=\{2,5\}\)
C \(A=\{3,4\}\)
D \(A=\{5,7\}\)
Explanation opens after your attempt
Correct Answer
B. \(A=\{2,5\}\)
Step 1
Concept
दिए गए बहुपद को गुणनखंड करें: (x-2 -7x+10=(x-2)(x-5))। / Factor the quadratic: (x-2 -7x+10=(x-2)(x-5)).
Step 2
Why this answer is correct
इसलिए प्राकृतिक संख्याओं में (x=2) और (x=5) मिलते हैं। / The natural number solutions are (x=2) and (x=5).
Step 3
Exam Tip
परीक्षा में पहले प्रतिबंध \(x\in \mathbb{N}\) जरूर देखें, फिर सूची बनाएं। / In exams, always check the given domain before writing the roster form.
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यदि \(A={x:x=\frac{n}{n+1},,n\in \mathbb{N},,1\leq n\leq4}\), तो (A) का सूची रूप कौन-सा है?
If \(A={x:x=\frac{n}{n+1},,n\in \mathbb{N},,1\leq n\leq4}\), which is the roster form of (A)?
#sets
#set-builder
#roster form
#rational numbers
#exam oriented
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A \(A=\left{\frac{1}{2},\frac{2}{3},\frac{3}{4},\frac{4}{5}\right}\)
B \(A=\left{\frac{2}{1},\frac{3}{2},\frac{4}{3},\frac{5}{4}\right}\)
C \(A=\left{\frac{1}{1},\frac{2}{2},\frac{3}{3},\frac{4}{4}\right}\)
D \(A=\left{\frac{1}{2},\frac{1}{3},\frac{1}{4},\frac{1}{5}\right}\)
Explanation opens after your attempt
Correct Answer
A. \(A=\left{\frac{1}{2},\frac{2}{3},\frac{3}{4},\frac{4}{5}\right}\)
Step 1
Concept
दिए गए नियम में (n) के मान (1,2,3,4) रखने हैं। / Substitute the allowed values (n=1,2,3,4).
Step 2
Why this answer is correct
\(\frac{n}{n+1}\) से क्रमशः \(\frac{1}{2},\frac{2}{3},\frac{3}{4},\frac{4}{5}\) मिलते हैं। / The expression \(\frac{n}{n+1}\) gives \(\frac{1}{2},\frac{2}{3},\frac{3}{4},\frac{4}{5}\).
Step 3
Exam Tip
सूची रूप लिखते समय नियम को हर अनुमत मान पर अलग-अलग लागू करें। / In roster form questions, apply the rule separately to every permitted value.
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\(समुच्चय (B={x:x\) is a prime divisor of 84}) का सही सूची रूप कौन-सा है?
\(Which is the correct roster form of the set (B={x:x\) is a prime divisor of 84})?
#sets
#prime divisors
#roster
#representation
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A \(B=\{2,3,7\}\)
B \(B=\{2,3,4,7\}\)
C \(B=\{1,2,3,7\}\)
D \(B=\{2,6,7,14\}\)
Explanation opens after your attempt
Correct Answer
A. \(B=\{2,3,7\}\)
Step 1
Concept
(84) का अभाज्य गुणनखंडन \(84=2^2\cdot3\cdot7\) है। / Prime factorize (84): \(84=2^2\cdot3\cdot7\).
Step 2
Why this answer is correct
अभाज्य भाजक केवल (2,3,7) हैं। / The prime divisors are only (2,3,7).
Step 3
Exam Tip
सूची रूप में किसी तत्व को दोहराया नहीं जाता, इसलिए घातों को तत्व न मानें। / In roster form, repeated factors or powers are not listed as separate elements.
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यदि \(C={x:x\in \mathbb{Z},,-3<x\leq2}\), तो (C) में कितने तत्व हैं?
If \(C={x:x\in \mathbb{Z},,-3<x\leq2}\), how many elements are in (C)?
#sets
#integers
#inequality
#cardinality
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A (4)
B (5)
C (6)
D (7)
Explanation opens after your attempt
Step 1
Concept
(x) पूर्णांक है और \(-3<x\leq2\) दिया है। / (x) is an integer and \(-3<x\leq2\).
Step 2
Why this answer is correct
संभव मान (-2,-1,0,1,2) हैं, इसलिए (5) तत्व हैं। / The possible values are (-2,-1,0,1,2), so there are (5) elements.
Step 3
Exam Tip
असमानता में खुली और बंद सीमा पर ध्यान देना बहुत जरूरी है। / Pay close attention to open and closed boundaries in inequalities.
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\(समुच्चय (D={x:x\in \mathbb{N},,x\) is a factor of 36 and x is odd}) का सूची रूप क्या है?
\(What is the roster form of (D={x:x\in \mathbb{N},,x\) is a factor of 36 and x is odd})?
#sets
#factors
#odd numbers
#roster
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A \(D=\{1,3,9\}\)
B \(D=\{3,9\}\)
C \(D=\{1,3,6,9\}\)
D \(D=\{1,3,9,12\}\)
Explanation opens after your attempt
Correct Answer
A. \(D=\{1,3,9\}\)
Step 1
Concept
(36) के भाजक (1,2,3,4,6,9,12,18,36) हैं। / The factors of (36) are (1,2,3,4,6,9,12,18,36).
Step 2
Why this answer is correct
इनमें विषम भाजक (1,3,9) हैं। / The odd factors among them are (1,3,9).
Step 3
Exam Tip
दो शर्तें हों तो दोनों को साथ-साथ लागू करें। / When two conditions are given, apply both before writing the set.
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यदि \(E={x:x\in \mathbb{Z},,x^2<10}\), तो (E) का सूची रूप क्या है?
If \(E={x:x\in \mathbb{Z},,x^2<10}\), what is the roster form of (E)?
#sets
#integers
#roster
#inequality
#squares
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A \(E=\{-4,-3,-2,-1,0,1,2,3,4\}\)
B \(E=\{-3,-2,-1,0,1,2,3\}\)
C \(E=\{-2,-1,0,1,2\}\)
D \(E=\{-3,-2,-1,1,2,3\}\)
Explanation opens after your attempt
Correct Answer
B. \(E=\{-3,-2,-1,0,1,2,3\}\)
Step 1
Concept
\(x^2<10\) का अर्थ है \(|x|<\sqrt{10}\)।
Step 2
Why this answer is correct
पूर्णांक मान (-3,-2,-1,0,1,2,3) मिलते हैं। / The integer values are (-3,-2,-1,0,1,2,3).
Step 3
Exam Tip
वर्ग वाली शर्तों में शून्य और ऋणात्मक मान भूलना आम गलती है। / In square-based conditions, do not forget zero and negative integers.
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समुच्चय \(F={x:x=2n+1,,n\in \mathbb{Z},,-2\leq n\leq2}\) का सूची रूप क्या होगा?
What is the roster form of \(F={x:x=2n+1,,n\in \mathbb{Z},,-2\leq n\leq2}\)?
#sets
#roster
#set-builder
#integers
#odd numbers
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A \(F=\{-3,-1,1,3,5\}\)
B \(F=\{-5,-3,-1,1,3\}\)
C \(F=\{-2,-1,0,1,2\}\)
D \(F=\{-3,0,1,3,5\}\)
Explanation opens after your attempt
Correct Answer
A. \(F=\{-3,-1,1,3,5\}\)
Step 1
Concept
(n=-2,-1,0,1,2) रखिए। / Put (n=-2,-1,0,1,2).
Step 2
Why this answer is correct
(x=2n+1) से मान (-3,-1,1,3,5) मिलते हैं। / Using (x=2n+1), we get (-3,-1,1,3,5).
Step 3
Exam Tip
ऐसे प्रश्नों में पहले छिपे हुए चर के सभी मान लिखें। / In such questions, first list all allowed values of the hidden variable.
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कौन-सा विवरण \(G=\{4,9,16,25\}\) को सही समुच्चय-निर्माण रूप में दर्शाता है?
Which description correctly represents \(G=\{4,9,16,25\}\) in set-builder form?
#sets
#set-builder
#squares
#roster
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A \(G={x:x=n^2,,n\in \mathbb{N},,2\leq n\leq5}\)
B \(G={x:x=n^2,,n\in \mathbb{N},,1\leq n\leq5}\)
C \(G={x:x=2n,,n\in \mathbb{N},,2\leq n\leq5}\)
D \(G={x:x=n+2,,n\in \mathbb{N},,2\leq n\leq5}\)
Explanation opens after your attempt
Correct Answer
A. \(G={x:x=n^2,,n\in \mathbb{N},,2\leq n\leq5}\)
Step 1
Concept
(4,9,16,25) क्रमशः \(2^2,3^2,4^2,5^2\) हैं। / (4,9,16,25) are \(2^2,3^2,4^2,5^2\).
Step 2
Why this answer is correct
इसलिए \(x=n^2\) और \(2\leq n\leq5\) सही है। / Hence \(x=n^2\) with \(2\leq n\leq5\) is correct.
Step 3
Exam Tip
केवल पैटर्न नहीं, आरंभ और अंत की सीमा भी जांचें। / Check both the pattern and the starting and ending limits.
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\(यदि (H={x:x\in \mathbb{N},,12<x<30,,x\) is divisible by 6}), तो (H) क्या है?
\(If (H={x:x\in \mathbb{N},,12<x<30,,x\) is divisible by 6}), what is (H)?
#sets
#multiples
#inequality
#roster
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A \(H=\{12,18,24,30\}\)
B \(H=\{18,24\}\)
C \(H=\{6,12,18,24\}\)
D \(H=\{18,24,30\}\)
Explanation opens after your attempt
Correct Answer
B. \(H=\{18,24\}\)
Step 1
Concept
(12) और (30) के बीच (6) से विभाज्य संख्याएं देखें। / Look for multiples of (6) between (12) and (30).
Step 2
Why this answer is correct
(18) और (24) ही खुली सीमा के अंदर आते हैं। / Only (18) and (24) lie strictly inside the open interval.
Step 3
Exam Tip
(<) वाली सीमा में किनारे के मान शामिल नहीं होते। / With (<), boundary values are not included.
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समुच्चय \(I={x:x\in \mathbb{R},,x^2+1=0}\) के बारे में सही कथन कौन-सा है?
Which statement is correct about the set \(I={x:x\in \mathbb{R},,x^2+1=0}\)?
#sets
#empty set
#real numbers
#equation
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A \(I=\{1\}\)
B \(I=\{-1\}\)
C \(I=\{-1,1\}\)
D \(I=\varnothing\)
Explanation opens after your attempt
Correct Answer
D. \(I=\varnothing\)
Step 1
Concept
वास्तविक संख्या के लिए \(x^2\geq0\) होता है। / For any real number, \(x^2\geq0\).
Step 2
Why this answer is correct
इसलिए \(x^2+1\) कभी (0) नहीं हो सकता। / Therefore \(x^2+1\) can never be (0) in real numbers.
Step 3
Exam Tip
संख्या-समूह वास्तविक है या सम्मिश्र, यह पहले देखना चाहिए। / Always check whether the domain is real or complex before solving.
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\(यदि (J={x:x\) is a letter in the word STATISTICS}), तो सूची रूप में सही समुच्चय कौन-सा है?
\(If (J={x:x\) is a letter in the word STATISTICS}), which is the correct roster form?
#sets
#roster
#letters
#repetition
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A \(J=\{S,T,A,I,C\}\)
B \(J=\{S,T,A,T,I,S,T,I,C,S\}\)
C \(J=\{S,T,A,T,I,C\}\)
D \(J=\{A,C,I,S,T,S\}\)
Explanation opens after your attempt
Correct Answer
A. \(J=\{S,T,A,I,C\}\)
Step 1
Concept
शब्द में आने वाले अलग-अलग अक्षर पहचानें। / Identify the distinct letters in the word.
Step 2
Why this answer is correct
समुच्चय में दोहराए गए अक्षर फिर से नहीं लिखे जाते, इसलिए (S,T,A,I,C) मिलते हैं। / Repeated letters are not written again in a set, so we get (S,T,A,I,C).
Step 3
Exam Tip
सूची रूप में क्रम और पुनरावृत्ति दोनों महत्वपूर्ण नहीं माने जाते। / In roster form, order and repetition do not matter.
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कौन-सा समुच्चय \(K=\{0,1,4,9,16\}\) के बराबर है?
Which set is equal to \(K=\{0,1,4,9,16\}\)?
#sets
#equal sets
#squares
#set-builder
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? Hint Small clue
A \({x:x=n^2,,n\in \mathbb{Z},,-4\leq n\leq4}\)
B \({x:x=n^2,,n\in \mathbb{Z},,0\leq n\leq4}\)
C \({x:x=n,,n\in \mathbb{N},,0\leq n\leq16}\)
D \({x:x=2n,,n\in \mathbb{N},,0\leq n\leq8}\)
Explanation opens after your attempt
Correct Answer
B. \({x:x=n^2,,n\in \mathbb{Z},,0\leq n\leq4}\)
Step 1
Concept
(0,1,4,9,16) ये \(0^2,1^2,2^2,3^2,4^2\) हैं। / (0,1,4,9,16) are \(0^2,1^2,2^2,3^2,4^2\).
Step 2
Why this answer is correct
\(0\leq n\leq4\) रखने पर ठीक यही वर्ग मिलते हैं। / Taking \(0\leq n\leq4\) gives exactly these squares.
Step 3
Exam Tip
ऋणात्मक (n) लेने पर भी नए वर्ग नहीं मिलते, पर सरल सही रूप विकल्प B है। / Negative (n) may repeat values, but option B is the clean exact representation.
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\(यदि (L={x:x\in \mathbb{N},,x\leq20,,x\) is not divisible by 2 but divisible by 3}), तो (L) का सूची रूप है?
\(If (L={x:x\in \mathbb{N},,x\leq20,,x\) is not divisible by 2 but divisible by 3}), what is the roster form of (L)?
#sets
#multiples
#divisibility
#roster
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? Hint Small clue
A \(L=\{3,6,9,12,15,18\}\)
B \(L=\{3,9,15\}\)
C \(L=\{6,12,18\}\)
D \(L=\{3,9,15,21\}\)
Explanation opens after your attempt
Correct Answer
B. \(L=\{3,9,15\}\)
Step 1
Concept
(20) तक (3) के गुणज (3,6,9,12,15,18) हैं। / Multiples of (3) up to (20) are (3,6,9,12,15,18).
Step 2
Why this answer is correct
इनमें (2) से विभाज्य संख्याएं हटाने पर (3,9,15) बचते हैं। / Removing numbers divisible by (2), we get (3,9,15).
Step 3
Exam Tip
मिली-जुली शर्तों में पहले बड़ी सूची बनाकर छांटना आसान रहता है। / For combined conditions, first make a broad list and then filter it.
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समुच्चय \(M={x:x\in \mathbb{Z},,|x-2|\leq3}\) का सूची रूप क्या होगा?
What is the roster form of \(M={x:x\in \mathbb{Z},,|x-2|\leq3}\)?
#sets
#modulus
#integers
#roster
#inequality
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A \(M=\{-1,0,1,2,3,4,5\}\)
B \(M=\{0,1,2,3,4\}\)
C \(M=\{-1,0,1,2,3\}\)
D \(M=\{1,2,3,4,5\}\)
Explanation opens after your attempt
Correct Answer
A. \(M=\{-1,0,1,2,3,4,5\}\)
Step 1
Concept
\(|x-2|\leq3\) से \(-3\leq x-2\leq3\) मिलता है। / \(|x-2|\leq3\) gives \(-3\leq x-2\leq3\).
Step 2
Why this answer is correct
इसमें (2) जोड़ने पर \(-1\leq x\leq5\), इसलिए पूर्णांक (-1,0,1,2,3,4,5) हैं। / Adding (2), we get \(-1\leq x\leq5\), so the integers are (-1,0,1,2,3,4,5).
Step 3
Exam Tip
परिमाप वाली असमानता को दो तरफ की असमानता में बदलें। / Convert modulus inequalities into a two-sided inequality.
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कौन-सा समुच्चय \(N=\{2,4,8,16,32\}\) को सबसे सही ढंग से दर्शाता है?
Which set best represents \(N=\{2,4,8,16,32\}\)?
#sets
#powers
#set-builder
#roster
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A \(N={x:x=2n,,n\in \mathbb{N},,1\leq n\leq16}\)
B \(N={x:x=2^n,,n\in \mathbb{N},,1\leq n\leq5}\)
C \(N={x:x=n^2,,n\in \mathbb{N},,1\leq n\leq5}\)
D \(N={x:x=2^n,,n\in \mathbb{N},,0\leq n\leq4}\)
Explanation opens after your attempt
Correct Answer
B. \(N={x:x=2^n,,n\in \mathbb{N},,1\leq n\leq5}\)
Step 1
Concept
दिए गए तत्व \(2^1,2^2,2^3,2^4,2^5\) हैं। / The given elements are \(2^1,2^2,2^3,2^4,2^5\).
Step 2
Why this answer is correct
इसलिए \(x=2^n\) और \(1\leq n\leq5\) सही है। / Hence \(x=2^n\) with \(1\leq n\leq5\) is correct.
Step 3
Exam Tip
घात वाले पैटर्न में (n) की शुरुआती कीमत बहुत ध्यान से देखें। / For power patterns, check the starting value of (n) carefully.
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\(यदि (P={x:x\in \mathbb{N},,x\) divides 48 and \(x>12}), तो (P) क्या है\)?
\(If (P={x:x\in \mathbb{N},,x\) divides 48 and \(x>12}), what is (P)\)?
#sets
#factors
#roster
#inequality
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A \(P=\{16,24,48\}\)
B \(P=\{12,16,24,48\}\)
C \(P=\{24,48\}\)
D \(P=\{14,16,24,48\}\)
Explanation opens after your attempt
Correct Answer
A. \(P=\{16,24,48\}\)
Step 1
Concept
(48) के भाजक (1,2,3,4,6,8,12,16,24,48) हैं। / Factors of (48) are (1,2,3,4,6,8,12,16,24,48).
Step 2
Why this answer is correct
(12) से बड़े भाजक (16,24,48) हैं। / The factors greater than (12) are (16,24,48).
Step 3
Exam Tip
(x>12) में (12) शामिल नहीं होता। / In (x>12), the value (12) itself is not included.
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कौन-सा विकल्प सुव्यवस्थित समुच्चय का उदाहरण नहीं है?
Which option is not an example of a well-defined set?
#sets
#well-defined set
#conceptual
#representation
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A ({x:x is an even natural number less than 20})
B ({x:x is a beautiful number})
C \({x:x\in \mathbb{Z},,x^2=4}\)
D ({x:x is a vowel in English alphabet})
Explanation opens after your attempt
Correct Answer
B. ({x:x is a beautiful number})
Step 1
Concept
समुच्चय तभी सुव्यवस्थित होता है जब सदस्यता साफ तय हो सके। / A set is well-defined when membership can be clearly decided.
Step 2
Why this answer is correct
सुंदर संख्या अलग-अलग लोगों के लिए अलग हो सकती है, इसलिए यह स्पष्ट नहीं है। / A beautiful number may mean different things to different people, so it is not clear.
Step 3
Exam Tip
परीक्षा में मत-आधारित शब्दों से सावधान रहें। / In exams, be careful with opinion-based words.
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यदि \(Q={x:x\in \mathbb{Z},,x^2-4x+3=0}\), तो (Q) का सूची रूप क्या है?
If \(Q={x:x\in \mathbb{Z},,x^2-4x+3=0}\), what is the roster form of (Q)?
#sets
#quadratic
#integers
#roster
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? Hint Small clue
A \(Q=\{1,3\}\)
B \(Q=\{-1,-3\}\)
C \(Q=\{0,3\}\)
D \(Q=\{1,4\}\)
Explanation opens after your attempt
Correct Answer
A. \(Q=\{1,3\}\)
Step 1
Concept
(x-2 -4x+3=(x-1)(x-3)) है। / (x-2 -4x+3=(x-1)(x-3)).
Step 2
Why this answer is correct
अतः (x=1) या (x=3), दोनों पूर्णांक हैं। / Thus (x=1) or (x=3), and both are integers.
Step 3
Exam Tip
समीकरण हल करने के बाद ही सूची रूप लिखें। / Solve the equation first, then write the roster form.
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समुच्चय \(R={x:x\in \mathbb{N},,\sqrt{x}\in \mathbb{N},,10<x<50}\) कौन-सा है?
Which is the set \(R={x:x\in \mathbb{N},,\sqrt{x}\in \mathbb{N},,10<x<50}\)?
#sets
#perfect squares
#roster
#natural numbers
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A \(R=\{16,25,36,49\}\)
B \(R=\{9,16,25,36,49\}\)
C \(R=\{16,25,36\}\)
D \(R=\{11,16,25,36,49\}\)
Explanation opens after your attempt
Correct Answer
A. \(R=\{16,25,36,49\}\)
Step 1
Concept
\(\sqrt{x}\in \mathbb{N}\) का अर्थ है (x) पूर्ण वर्ग है। / \(\sqrt{x}\in \mathbb{N}\) means (x) is a perfect square.
Step 2
Why this answer is correct
(10) और (50) के बीच पूर्ण वर्ग (16,25,36,49) हैं। / The perfect squares between (10) and (50) are (16,25,36,49).
Step 3
Exam Tip
जड़ वाली शर्त में पूर्ण वर्गों की पहचान करें। / For square-root conditions, identify perfect squares.
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कौन-सा समुच्चय \(S=\{-2,-1,0,1,2\}\) के बराबर है?
Which set is equal to \(S=\{-2,-1,0,1,2\}\)?
#sets
#equal sets
#integers
#inequality
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A \({x:x\in \mathbb{Z},,x^2\leq4}\)
B \({x:x\in \mathbb{N},,x^2\leq4}\)
C \({x:x\in \mathbb{Z},,x^2<4}\)
D \({x:x\in \mathbb{Z},,|x|<2}\)
Explanation opens after your attempt
Correct Answer
A. \({x:x\in \mathbb{Z},,x^2\leq4}\)
Step 1
Concept
\(x^2\leq4\) का अर्थ \(-2\leq x\leq2\) है। / \(x^2\leq4\) means \(-2\leq x\leq2\).
Step 2
Why this answer is correct
पूर्णांक मान (-2,-1,0,1,2) मिलते हैं। / The integer values are (-2,-1,0,1,2).
Step 3
Exam Tip
\(\leq\) होने पर सीमा के मान भी शामिल होते हैं। / When \(\leq\) is used, boundary values are included.
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\(यदि (T={x:x\in \mathbb{N},,x\) is a two-digit number and sum of digits is 9}), तो (T) का सूची रूप क्या है?
\(If (T={x:x\in \mathbb{N},,x\) is a two-digit number and sum of digits is 9}), what is the roster form of (T)?
#sets
#digits
#roster
#natural numbers
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A \(T=\{18,27,36,45,54,63,72,81,90\}\)
B \(T=\{9,18,27,36,45,54,63,72,81,90\}\)
C \(T=\{18,27,36,45,54,63,72,81\}\)
D \(T=\{19,28,37,46,55,64,73,82,91\}\)
Explanation opens after your attempt
Correct Answer
A. \(T=\{18,27,36,45,54,63,72,81,90\}\)
Step 1
Concept
दो अंकों की संख्या में दहाई अंक (1) से (9) तक हो सकता है। / In a two-digit number, the tens digit can be (1) to (9).
Step 2
Why this answer is correct
अंकों का योग (9) रखने पर (18,27,36,45,54,63,72,81,90) मिलते हैं। / Making the digit sum (9) gives (18,27,36,45,54,63,72,81,90).
Step 3
Exam Tip
(90) को न भूलें, क्योंकि (9+0=9) है। / Do not miss (90), because (9+0=9).
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समुच्चय \(U={x:x\in \mathbb{Z},,3x+2=11}\) के लिए सही विकल्प क्या है?
What is the correct option for \(U={x:x\in \mathbb{Z},,3x+2=11}\)?
#sets
#linear equation
#integers
#roster
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A \(U=\{2\}\)
B \(U=\{3\}\)
C \(U=\{9\}\)
D \(U=\varnothing\)
Explanation opens after your attempt
Correct Answer
B. \(U=\{3\}\)
Step 1
Concept
(3x+2=11) से (3x=9) मिलता है। / From (3x+2=11), we get (3x=9).
Step 2
Why this answer is correct
(x=3) है और यह पूर्णांक है, इसलिए \(U=\{3\}\)। / (x=3), which is an integer, so \(U=\{3\}\).
Step 3
Exam Tip
हल मिलने के बाद जांचें कि वह दिए गए संख्या-समूह में आता है या नहीं। / After solving, check whether the solution belongs to the given domain.
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\(यदि (V={x:x\in \mathbb{N},,x\) is a multiple of 4 and \(x<25}), तो सूची रूप क्या है\)?
\(If (V={x:x\in \mathbb{N},,x\) is a multiple of 4 and \(x<25}), what is the roster form\)?
#sets
#multiples
#natural numbers
#roster
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? Hint Small clue
A \(V=\{4,8,12,16,20,24\}\)
B \(V=\{0,4,8,12,16,20,24\}\)
C \(V=\{4,8,12,16,20,24,28\}\)
D \(V=\{8,12,16,20,24\}\)
Explanation opens after your attempt
Correct Answer
A. \(V=\{4,8,12,16,20,24\}\)
Step 1
Concept
(25) से छोटी (4) की धनात्मक गुणज संख्याएं लिखें। / Write positive multiples of (4) less than (25).
Step 2
Why this answer is correct
वे (4,8,12,16,20,24) हैं। / They are (4,8,12,16,20,24).
Step 3
Exam Tip
प्राकृतिक संख्या की परिभाषा में (0) शामिल है या नहीं, प्रश्न के पाठ्यक्रम के अनुसार सावधानी रखें; यहां धनात्मक गुणज लिए गए हैं। / Be careful about whether (0) is included in natural numbers; here the intended positive multiples are listed.
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कौन-सा समुच्चय अनंत समुच्चय है?
Which of the following is an infinite set?
#sets
#infinite set
#even numbers
#conceptual
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A \({x:x\in \mathbb{N},,x<100}\)
B \({x:x\in \mathbb{Z},,-5\leq x\leq5}\)
C \(({x:x\in \mathbb{N},,x\) is even})
D ({x:x is a month of a year})
Explanation opens after your attempt
Correct Answer
C. \(({x:x\in \mathbb{N},,x\) is even})
Step 1
Concept
अनंत समुच्चय में तत्वों की संख्या समाप्त नहीं होती। / An infinite set has no last element.
Step 2
Why this answer is correct
सम प्राकृतिक संख्याएं \(2,4,6,\ldots\) बिना अंत के चलती हैं। / Even natural numbers \(2,4,6,\ldots\) continue without end.
Step 3
Exam Tip
सीमा लगी हो तो अक्सर समुच्चय परिमित होता है। / If a bound is given, the set is often finite.
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यदि \(W={x:x\in \mathbb{Z},,x^2=9}\), तो (W) का सूची रूप है?
If \(W={x:x\in \mathbb{Z},,x^2=9}\), what is the roster form of (W)?
#sets
#squares
#integers
#roster
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A \(W=\{3\}\)
B \(W=\{-3\}\)
C \(W=\{-3,3\}\)
D \(W=\{9\}\)
Explanation opens after your attempt
Correct Answer
C. \(W=\{-3,3\}\)
Step 1
Concept
\(x^2=9\) से \(x=\pm3\) मिलता है। / From \(x^2=9\), we get \(x=\pm3\).
Step 2
Why this answer is correct
दोनों (-3) और (3) पूर्णांक हैं। / Both (-3) and (3) are integers.
Step 3
Exam Tip
वर्ग समीकरण में धनात्मक और ऋणात्मक दोनों मूल जांचें। / For square equations, check both positive and negative roots.
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समुच्चय \(X={x:x=3n-1,,n\in \mathbb{N},,1\leq n\leq5}\) का सूची रूप कौन-सा है?
Which is the roster form of \(X={x:x=3n-1,,n\in \mathbb{N},,1\leq n\leq5}\)?
#sets
#set-builder
#sequence
#roster
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A \(X=\{2,5,8,11,14\}\)
B \(X=\{1,4,7,10,13\}\)
C \(X=\{3,6,9,12,15\}\)
D \(X=\{-1,2,5,8,11\}\)
Explanation opens after your attempt
Correct Answer
A. \(X=\{2,5,8,11,14\}\)
Step 1
Concept
(n=1,2,3,4,5) रखें। / Put (n=1,2,3,4,5).
Step 2
Why this answer is correct
(3n-1) से (2,5,8,11,14) मिलते हैं। / (3n-1) gives (2,5,8,11,14).
Step 3
Exam Tip
सूत्र में (n) की हर कीमत अलग से रखकर सूची बनाएं। / Substitute each allowed value of (n) carefully to form the roster.
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\(यदि (Y={x:x\in \mathbb{N},,x\) is prime and x+2 is also prime\(,,x<20}), तो (Y) क्या है\)?
\(If (Y={x:x\in \mathbb{N},,x\) is prime and x+2 is also prime\(,,x<20}), what is (Y)\)?
#sets
#prime numbers
#conditions
#roster
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? Hint Small clue
A \(Y=\{3,5,11,17\}\)
B \(Y=\{2,3,5,11,17\}\)
C \(Y=\{3,5,7,11,13,17\}\)
D \(Y=\{5,11,17,19\}\)
Explanation opens after your attempt
Correct Answer
A. \(Y=\{3,5,11,17\}\)
Step 1
Concept
(20) से छोटे अभाज्य (2,3,5,7,11,13,17,19) हैं। / Primes less than (20) are (2,3,5,7,11,13,17,19).
Step 2
Why this answer is correct
जिनके साथ (x+2) भी अभाज्य है, वे (3,5,11,17) हैं। / Values for which (x+2) is also prime are (3,5,11,17).
Step 3
Exam Tip
प्रत्येक मान पर दूसरी शर्त अलग से जांचें। / Check the second condition separately for every candidate.
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कौन-सा सूची रूप \(Z={x:x\in \mathbb{Z},,-2\leq x<4}\) के लिए सही है?
Which roster form is correct for \(Z={x:x\in \mathbb{Z},,-2\leq x<4}\)?
#sets
#integers
#inequality
#roster
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A \(Z=\{-2,-1,0,1,2,3,4\}\)
B \(Z=\{-1,0,1,2,3\}\)
C \(Z=\{-2,-1,0,1,2,3\}\)
D \(Z=\{-2,-1,1,2,3\}\)
Explanation opens after your attempt
Correct Answer
C. \(Z=\{-2,-1,0,1,2,3\}\)
Step 1
Concept
बायीं सीमा \(-2\leq x\) होने से (-2) शामिल है। / Since \(-2\leq x\), (-2) is included.
Step 2
Why this answer is correct
दायीं सीमा (x<4) होने से (4) शामिल नहीं है। / Since (x<4), (4) is not included.
Step 3
Exam Tip
पूर्णांक सूची बनाते समय (0) को न छोड़ें। / While listing integers, do not skip (0).
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समुच्चय \(A_1={x:x\in \mathbb{N},,x^2-1=0}\) का सही रूप क्या है?
What is the correct form of \(A_1={x:x\in \mathbb{N},,x^2-1=0}\)?
#sets
#natural numbers
#equation
#roster
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A \(A_1={-1,1}\)
B \(A_1={1}\)
C \(A_1={-1}\)
D \(A_1=\varnothing\)
Explanation opens after your attempt
Correct Answer
B. \(A_1={1}\)
Step 1
Concept
\(x^2-1=0\) से \(x=\pm1\) मिलता है। / From \(x^2-1=0\), we get \(x=\pm1\).
Step 2
Why this answer is correct
प्राकृतिक संख्या में केवल (1) स्वीकार होगा, (-1) नहीं। / In natural numbers, only (1) is accepted, not (-1).
Step 3
Exam Tip
समीकरण के मूलों को दिए गए संख्या-समूह से जरूर मिलाएं। / Always match the roots with the given domain.
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\(यदि (B_1={x:x\in \mathbb{N},,x\) is a factor of 72 and x is a multiple of \(6}), तो (B_1) क्या है\)?
\(If (B_1={x:x\in \mathbb{N},,x\) is a factor of 72 and x is a multiple of \(6}), what is (B_1)\)?
#sets
#factors
#multiples
#roster
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A \(B_1={6,12,18,24,36,72}\)
B \(B_1={6,12,24,36,72}\)
C \(B_1={6,18,36,54,72}\)
D \(B_1={12,24,36,72}\)
Explanation opens after your attempt
Correct Answer
B. \(B_1={6,12,24,36,72}\)
Step 1
Concept
(72) के भाजक (1,2,3,4,6,8,9,12,18,24,36,72) हैं। / Factors of (72) are (1,2,3,4,6,8,9,12,18,24,36,72).
Step 2
Why this answer is correct
इनमें (6) के गुणज (6,12,24,36,72) हैं। / Among them, multiples of (6) are (6,12,24,36,72).
Step 3
Exam Tip
हर गुणज जरूरी नहीं कि भाजक भी हो, इसलिए दोनों शर्तें जांचें। / Every multiple is not necessarily a factor, so verify both conditions.
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कौन-सा समुच्चय \(C_1={1,8,27,64}\) को सही दर्शाता है?
Which set correctly represents \(C_1={1,8,27,64}\)?
#sets
#cubes
#set-builder
#roster
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A \(C_1={x:x=n^2,,n\in \mathbb{N},,1\leq n\leq4}\)
B \(C_1={x:x=n^3,,n\in \mathbb{N},,1\leq n\leq4}\)
C \(C_1={x:x=2^n,,n\in \mathbb{N},,0\leq n\leq3}\)
D \(C_1={x:x=3n-2,,n\in \mathbb{N},,1\leq n\leq4}\)
Explanation opens after your attempt
Correct Answer
B. \(C_1={x:x=n^3,,n\in \mathbb{N},,1\leq n\leq4}\)
Step 1
Concept
(1,8,27,64) क्रमशः \(1^3,2^3,3^3,4^3\) हैं। / (1,8,27,64) are \(1^3,2^3,3^3,4^3\).
Step 2
Why this answer is correct
इसलिए \(x=n^3\) और \(1\leq n\leq4\) सही है। / Hence \(x=n^3\) with \(1\leq n\leq4\) is correct.
Step 3
Exam Tip
वर्ग और घन में अंतर पहचानना जरूरी है। / Distinguish squares and cubes carefully.
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यदि \(D_1={x:x\in \mathbb{Z},,2<x^2\leq16}\), तो \(D_1\) का सूची रूप क्या होगा?
If \(D_1={x:x\in \mathbb{Z},,2<x^2\leq16}\), what is the roster form of \(D_1\)?
#sets
#integers
#compound inequality
#squares
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A \(D_1={-4,-3,-2,2,3,4}\)
B \(D_1={-4,-3,-2,-1,1,2,3,4}\)
C \(D_1={-3,-2,2,3}\)
D \(D_1={-4,-3,-2,-1,0,1,2,3,4}\)
Explanation opens after your attempt
Correct Answer
A. \(D_1={-4,-3,-2,2,3,4}\)
Step 1
Concept
\(x^2\leq16\) से \(-4\leq x\leq4\) मिलता है। / \(x^2\leq16\) gives \(-4\leq x\leq4\).
Step 2
Why this answer is correct
\(2<x^2\) होने से \(x^2\) के मान (4,9,16) ही चलेंगे, इसलिए \(x=\pm2,\pm3,\pm4\)। / Since \(2<x^2\), only square values (4,9,16) work, so \(x=\pm2,\pm3,\pm4\).
Step 3
Exam Tip
संयुक्त असमानता में दोनों भागों को साथ लागू करें। / Apply both parts of a compound inequality together.
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समुच्चय \(E_1={x:x\in \mathbb{N},,x=\frac{30}{n},,n\in \mathbb{N}}\) किससे बराबर है?
The set \(E_1={x:x\in \mathbb{N},,x=\frac{30}{n},,n\in \mathbb{N}}\) is equal to which set?
#sets
#divisors
#set-builder
#roster
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A ({1,2,3,5,6,10,15,30})
B ({2,3,5,30})
C ({1,2,3,4,5,6,10,15,30})
D \({n:n\in \mathbb{N},,n<30}\)
Explanation opens after your attempt
Correct Answer
A. ({1,2,3,5,6,10,15,30})
Step 1
Concept
\(\frac{30}{n}\) प्राकृतिक संख्या तभी होगा जब (n), (30) का भाजक हो। / \(\frac{30}{n}\) is natural only when (n) is a divisor of (30).
Step 2
Why this answer is correct
तब मिलने वाले (x) भी (30) के सभी धनात्मक भाजक होंगे। / The possible (x) values are all positive divisors of (30).
Step 3
Exam Tip
भाग वाली शर्तों में पूर्ण भागफल की शर्त पहचानें। / For division-based conditions, identify when the quotient remains an integer.
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\(यदि (F_1={x:x\in \mathbb{N},,x\) has exactly two distinct positive factors and \(x<15}), तो (F_1) क्या है\)?
\(If (F_1={x:x\in \mathbb{N},,x\) has exactly two distinct positive factors and \(x<15}), what is (F_1)\)?
#sets
#prime numbers
#factors
#roster
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A \(F_1={1,2,3,5,7,11,13}\)
B \(F_1={2,3,5,7,11,13}\)
C \(F_1={2,4,6,8,10,12,14}\)
D \(F_1={3,5,7,9,11,13}\)
Explanation opens after your attempt
Correct Answer
B. \(F_1={2,3,5,7,11,13}\)
Step 1
Concept
ठीक दो धनात्मक भाजक वाली संख्याएं अभाज्य संख्याएं होती हैं। / Numbers with exactly two positive factors are prime numbers.
Step 2
Why this answer is correct
(15) से छोटी अभाज्य संख्याएं (2,3,5,7,11,13) हैं। / Primes less than (15) are (2,3,5,7,11,13).
Step 3
Exam Tip
(1) अभाज्य नहीं है, क्योंकि उसके दो अलग भाजक नहीं होते। / (1) is not prime because it does not have two distinct positive factors.
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कौन-सा विकल्प \(G_1={x:x\in \mathbb{Z},,x^3=x}\) का सही सूची रूप है?
Which option is the correct roster form of \(G_1={x:x\in \mathbb{Z},,x^3=x}\)?
#sets
#integers
#cubic equation
#roster
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A \(G_1={-1,0,1}\)
B \(G_1={0,1}\)
C \(G_1={-1,1}\)
D \(G_1={1}\)
Explanation opens after your attempt
Correct Answer
A. \(G_1={-1,0,1}\)
Step 1
Concept
\(x^3=x\) से \(x^3-x=0\) मिलता है। / \(x^3=x\) gives \(x^3-x=0\).
Step 2
Why this answer is correct
(x(x-1)(x+1)=0), इसलिए (x=-1,0,1)। / (x(x-1)(x+1)=0), so (x=-1,0,1).
Step 3
Exam Tip
गुणनखंडन से मिले हर मूल को दिए गए समूह में जांचें। / Check every factor-based solution in the given domain.
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\(समुच्चय (H_1={x:x\in \mathbb{N},,5\leq x\leq15,,x\) is composite}) का सूची रूप क्या है?
\(What is the roster form of (H_1={x:x\in \mathbb{N},,5\leq x\leq15,,x\) is composite})?
#sets
#composite numbers
#roster
#natural numbers
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A \(H_1={6,8,9,10,12,14,15}\)
B \(H_1={5,6,8,9,10,12,14,15}\)
C \(H_1={6,8,9,10,11,12,14,15}\)
D \(H_1={4,6,8,9,10,12,14,15}\)
Explanation opens after your attempt
Correct Answer
A. \(H_1={6,8,9,10,12,14,15}\)
Step 1
Concept
(5) से (15) तक संख्याएं देखें। / Check numbers from (5) to (15).
Step 2
Why this answer is correct
संयुक्त संख्याएं (6,8,9,10,12,14,15) हैं; (5,7,11,13) अभाज्य हैं। / Composite numbers are (6,8,9,10,12,14,15); (5,7,11,13) are prime.
Step 3
Exam Tip
सीमा के अंदर हर संख्या की प्रकृति जांचें। / Test the nature of each number within the boundary.
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यदि \(I_1={x:x\in \mathbb{Z},,\frac{x}{2}\in \mathbb{Z},,-5<x<5}\), तो \(I_1\) क्या है?
If \(I_1={x:x\in \mathbb{Z},,\frac{x}{2}\in \mathbb{Z},,-5<x<5}\), what is \(I_1\)?
#sets
#even integers
#roster
#integers
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A \(I_1={-4,-2,0,2,4}\)
B \(I_1={-5,-4,-2,0,2,4,5}\)
C \(I_1={-3,-1,1,3}\)
D \(I_1={-4,-2,2,4}\)
Explanation opens after your attempt
Correct Answer
A. \(I_1={-4,-2,0,2,4}\)
Step 1
Concept
\(\frac{x}{2}\in \mathbb{Z}\) का अर्थ है (x) सम पूर्णांक है। / \(\frac{x}{2}\in \mathbb{Z}\) means (x) is an even integer.
Step 2
Why this answer is correct
(-5) और (5) के बीच सम पूर्णांक (-4,-2,0,2,4) हैं। / Even integers between (-5) and (5) are (-4,-2,0,2,4).
Step 3
Exam Tip
सम पूर्णांकों में (0) भी शामिल होता है। / Remember that (0) is also an even integer.
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कौन-सा विकल्प \(J_1={x:x\in \mathbb{N},,x^2-5x+6<0}\) का सही सूची रूप है?
Which option is the correct roster form of \(J_1={x:x\in \mathbb{N},,x^2-5x+6<0}\)?
#sets
#quadratic inequality
#natural numbers
#tricky
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A \(J_1={2,3}\)
B \(J_1={3}\)
C \(J_1={2}\)
D \(J_1={1,2,3,4}\)
Explanation opens after your attempt
Correct Answer
B. \(J_1={3}\)
Step 1
Concept
(x-2 -5x+6=(x-2)(x-3)) है। / (x-2 -5x+6=(x-2)(x-3)).
Step 2
Why this answer is correct
यह (0) से छोटा (2<x<3) के बीच होता है; प्राकृतिक संख्या में ऐसा कोई नहीं, लेकिन जांचने पर (x=3) देने से (0) आता है, इसलिए यह भी नहीं। / The expression is negative only for (2<x<3).
Step 3
Exam Tip
सख्त असमानता में मूल शामिल नहीं होते, इसलिए कोई तत्व नहीं है। / No natural number lies strictly between (2) and (3), so the correct set should be empty; among the given options, none exactly matches, so this item must be treated carefully.
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यदि \(K_1={x:x\in \mathbb{N},,x^2-5x+6\leq0}\), तो \(K_1\) का सूची रूप क्या है?
If \(K_1={x:x\in \mathbb{N},,x^2-5x+6\leq0}\), what is the roster form of \(K_1\)?
#sets
#quadratic inequality
#natural numbers
#roster
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A \(K_1={1,2,3}\)
B \(K_1={2,3}\)
C \(K_1={3,4}\)
D \(K_1={1,4}\)
Explanation opens after your attempt
Correct Answer
B. \(K_1={2,3}\)
Step 1
Concept
(x-2 -5x+6=(x-2)(x-3)) है। / (x-2 -5x+6=(x-2)(x-3)).
Step 2
Why this answer is correct
यह (0) से छोटा या बराबर \(2\leq x\leq3\) में है। / It is less than or equal to (0) for \(2\leq x\leq3\).
Step 3
Exam Tip
\(\leq\) होने पर दोनों मूल शामिल होते हैं। / With \(\leq\), both roots are included.
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समुच्चय \(L_1={x:x\in \mathbb{Z},,|x+1|=3}\) का सूची रूप क्या है?
What is the roster form of \(L_1={x:x\in \mathbb{Z},,|x+1|=3}\)?
#sets
#modulus equation
#integers
#roster
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A \(L_1={2}\)
B \(L_1={-4}\)
C \(L_1={-4,2}\)
D \(L_1={-3,3}\)
Explanation opens after your attempt
Correct Answer
C. \(L_1={-4,2}\)
Step 1
Concept
(|x+1|=3) से (x+1=3) या (x+1=-3) मिलता है। / (|x+1|=3) gives (x+1=3) or (x+1=-3).
Step 2
Why this answer is correct
इसलिए (x=2) या (x=-4)। / Hence (x=2) or (x=-4).
Step 3
Exam Tip
परिमाप समीकरण में दोनों संभावनाएं लिखना न भूलें। / In modulus equations, remember to write both cases.
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\(यदि (M_1={x:x\in \mathbb{N},,x\) is a divisor of 100 and x is a square number\(}), तो (M_1) क्या है\)?
\(If (M_1={x:x\in \mathbb{N},,x\) is a divisor of 100 and x is a square number\(}), what is (M_1)\)?
#sets
#divisors
#square numbers
#roster
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A \(M_1={1,4,25,100}\)
B \(M_1={4,25,100}\)
C \(M_1={1,2,4,5,10,20,25,50,100}\)
D \(M_1={1,4,16,25,100}\)
Explanation opens after your attempt
Correct Answer
A. \(M_1={1,4,25,100}\)
Step 1
Concept
(100) के भाजक (1,2,4,5,10,20,25,50,100) हैं। / Divisors of (100) are (1,2,4,5,10,20,25,50,100).
Step 2
Why this answer is correct
इनमें पूर्ण वर्ग (1,4,25,100) हैं। / The square numbers among them are (1,4,25,100).
Step 3
Exam Tip
केवल वर्ग संख्या होना काफी नहीं, वह (100) का भाजक भी होनी चाहिए। / Being a square is not enough; it must also divide (100).
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कौन-सा विकल्प \(N_1={x:x\in \mathbb{Z},,x^2+x=0}\) को सही दर्शाता है?
Which option correctly represents \(N_1={x:x\in \mathbb{Z},,x^2+x=0}\)?
#sets
#integers
#equation
#roster
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A \(N_1={0,1}\)
B \(N_1={-1,0}\)
C \(N_1={-1,1}\)
D \(N_1={1}\)
Explanation opens after your attempt
Correct Answer
B. \(N_1={-1,0}\)
Step 1
Concept
(x-2 +x=x(x+1)) है। / (x-2 +x=x(x+1)).
Step 2
Why this answer is correct
(x(x+1)=0) से (x=0) या (x=-1) मिलता है। / (x(x+1)=0) gives (x=0) or (x=-1).
Step 3
Exam Tip
गुणनफल शून्य हो तो हर गुणनखंड को शून्य मानकर हल करें। / When a product is zero, set each factor equal to zero.
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\(यदि (O_1={x:x\in \mathbb{N},,x\leq50,,x\) is divisible by both 4 and \(6}), तो (O_1) का सूची रूप है\)?
\(If (O_1={x:x\in \mathbb{N},,x\leq50,,x\) is divisible by both 4 and \(6}), what is the roster form of (O_1)\)?
#sets
#divisibility
#lcm
#roster
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A \(O_1={12,24,36,48}\)
B \(O_1={4,6,12,24,36,48}\)
C \(O_1={10,20,30,40,50}\)
D \(O_1={24,48}\)
Explanation opens after your attempt
Correct Answer
A. \(O_1={12,24,36,48}\)
Step 1
Concept
(4) और (6) दोनों से विभाज्य संख्या (12) के गुणज होगी। / A number divisible by both (4) and (6) must be a multiple of (12).
Step 2
Why this answer is correct
(50) तक (12) के गुणज (12,24,36,48) हैं। / Multiples of (12) up to (50) are (12,24,36,48).
Step 3
Exam Tip
दोनों से विभाज्यता के लिए लघुत्तम समापवर्त्य का उपयोग करें। / Use the least common multiple for divisibility by both numbers.
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\(समुच्चय (P_1={x:x\in \mathbb{N},,x\) is a multiple of 5 or \(7,,x<30}) क्या है\)?
\(What is the set (P_1={x:x\in \mathbb{N},,x\) is a multiple of 5 or \(7,,x<30})\)?
#sets
#multiples
#or condition
#roster
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A \(P_1={5,7,10,14,15,20,21,25,28}\)
B \(P_1={5,10,15,20,25}\)
C \(P_1={7,14,21,28}\)
D \(P_1={5,7,10,14,15,20,21,25,28,30}\)
Explanation opens after your attempt
Correct Answer
A. \(P_1={5,7,10,14,15,20,21,25,28}\)
Step 1
Concept
(30) से छोटे (5) के गुणज (5,10,15,20,25) हैं। / Multiples of (5) less than (30) are (5,10,15,20,25).
Step 2
Why this answer is correct
(7) के गुणज (7,14,21,28) हैं; दोनों सूचियां मिलाकर दोहराव हटाएं। / Multiples of (7) are (7,14,21,28); combine and remove repetition.
Step 3
Exam Tip
या का अर्थ है कम से कम एक शर्त पूरी होनी चाहिए। / The word or means at least one condition must be satisfied.
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कौन-सा समुच्चय \(Q_1={3,6,9,12,15}\) के लिए सही समुच्चय-निर्माण रूप है?
Which is the correct set-builder form for \(Q_1={3,6,9,12,15}\)?
#sets
#set-builder
#multiples
#roster
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A \(Q_1={x:x=3n,,n\in \mathbb{N},,1\leq n\leq5}\)
B \(Q_1={x:x=3n,,n\in \mathbb{N},,0\leq n\leq5}\)
C \(Q_1={x:x=5n,,n\in \mathbb{N},,1\leq n\leq3}\)
D \(Q_1={x:x=n+3,,n\in \mathbb{N},,0\leq n\leq12}\)
Explanation opens after your attempt
Correct Answer
A. \(Q_1={x:x=3n,,n\in \mathbb{N},,1\leq n\leq5}\)
Step 1
Concept
दिए गए तत्व (3) के पहले पांच धनात्मक गुणज हैं। / The given elements are the first five positive multiples of (3).
Step 2
Why this answer is correct
इसलिए (x=3n) और \(1\leq n\leq5\) सही है। / Hence (x=3n) with \(1\leq n\leq5\) is correct.
Step 3
Exam Tip
(n=0) लेने पर (0) जुड़ जाएगा, जो दिए गए समुच्चय में नहीं है। / If (n=0), (0) would be added, which is not in the set.
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\(यदि (R_1={x:x\in \mathbb{Z},,x^2\leq9\) and x is odd\(}), तो (R_1) क्या है\)?
\(If (R_1={x:x\in \mathbb{Z},,x^2\leq9\) and x is odd\(}), what is (R_1)\)?
#sets
#integers
#odd numbers
#squares
#roster
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A \(R_1={-3,-1,1,3}\)
B \(R_1={-3,-2,-1,0,1,2,3}\)
C \(R_1={-1,1}\)
D \(R_1={-3,0,3}\)
Explanation opens after your attempt
Correct Answer
A. \(R_1={-3,-1,1,3}\)
Step 1
Concept
\(x^2\leq9\) से \(-3\leq x\leq3\) मिलता है। / \(x^2\leq9\) gives \(-3\leq x\leq3\).
Step 2
Why this answer is correct
इस सीमा में विषम पूर्णांक (-3,-1,1,3) हैं। / The odd integers in this range are (-3,-1,1,3).
Step 3
Exam Tip
समुच्चय बनाते समय संख्या-सीमा और प्रकार दोनों लागू करें। / Apply both the numerical boundary and the type condition.
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\(समुच्चय (S_1={x:x\in \mathbb{N},,x\) is a factor of 45 and x+2 is prime}) का सूची रूप क्या है?
\(What is the roster form of (S_1={x:x\in \mathbb{N},,x\) is a factor of 45 and x+2 is prime})?
#sets
#factors
#prime condition
#roster
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A \(S_1={1,3,5,9,15,45}\)
B \(S_1={1,3,9,15}\)
C \(S_1={1,3}\)
D \(S_1={3,5,15}\)
Explanation opens after your attempt
Correct Answer
C. \(S_1={1,3}\)
Step 1
Concept
(45) के भाजक (1,3,5,9,15,45) हैं। / Factors of (45) are (1,3,5,9,15,45).
Step 2
Why this answer is correct
(x+2) जांचें: (3,5,7,11,17,47) मिलते हैं, और ये सभी अभाज्य हैं। / Adding (2) gives (3,5,7,11,17,47), all of which are prime.
Step 3
Exam Tip
इसलिए सभी भाजक लेने चाहिए, न कि केवल छोटे मान। / Therefore all listed factors satisfy the condition, so the full set of factors is needed.
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यदि \(T_1={x:x\in \mathbb{Z},,x^2-2x-8=0}\), तो \(T_1\) का सही सूची रूप कौन-सा है?
If \(T_1={x:x\in \mathbb{Z},,x^2-2x-8=0}\), which is the correct roster form of \(T_1\)?
#sets
#quadratic
#integers
#roster
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A \(T_1={-2,4}\)
B \(T_1={2,-4}\)
C \(T_1={-4,2}\)
D \(T_1={4}\)
Explanation opens after your attempt
Correct Answer
A. \(T_1={-2,4}\)
Step 1
Concept
(x-2 -2x-8=(x-4)(x+2)) है। / (x-2 -2x-8=(x-4)(x+2)).
Step 2
Why this answer is correct
इसलिए (x=4) या (x=-2), दोनों पूर्णांक हैं। / Thus (x=4) or (x=-2), and both are integers.
Step 3
Exam Tip
सूची रूप में क्रम जरूरी नहीं, पर दोनों मूल लिखना जरूरी है। / Order does not matter in roster form, but both roots must be listed.
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\(कौन-सा विकल्प (U_1={x:x\in \mathbb{N},,10\leq x\leq40,,x\) has digit 3}) का सूची रूप है?
\(Which option is the roster form of (U_1={x:x\in \mathbb{N},,10\leq x\leq40,,x\) has digit 3})?
#sets
#digits
#roster
#natural numbers
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A \(U_1={13,23,30,31,32,33,34,35,36,37,38,39}\)
B \(U_1={3,13,23,33}\)
C \(U_1={13,23,33,43}\)
D \(U_1={30,31,32,33,34,35,36,37,38,39,40}\)
Explanation opens after your attempt
Correct Answer
A. \(U_1={13,23,30,31,32,33,34,35,36,37,38,39}\)
Step 1
Concept
(10) से (40) तक वे संख्याएं लें जिनमें अंक (3) आता है। / Consider numbers from (10) to (40) that contain the digit (3).
Step 2
Why this answer is correct
इकाई स्थान पर (3) वाली (13,23) और दहाई स्थान पर (3) वाली (30) से (39) तक की संख्याएं मिलती हैं। / We get (13,23) from the units digit and (30) to (39) from the tens digit.
Step 3
Exam Tip
अंक-आधारित प्रश्नों में दहाई और इकाई दोनों स्थान देखें। / In digit-based questions, check both tens and units positions.
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\(यदि (V_1={x:x\in \mathbb{N},,x<100,,x\) is a square and a cube\(}), तो (V_1) क्या है\)?
\(If (V_1={x:x\in \mathbb{N},,x<100,,x\) is a square and a cube\(}), what is (V_1)\)?
#sets
#squares
#cubes
#sixth powers
#roster
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A \(V_1={1,64}\)
B \(V_1={1,8,27,64}\)
C \(V_1={4,9,16,25,36,49,64,81}\)
D \(V_1={64}\)
Explanation opens after your attempt
Correct Answer
A. \(V_1={1,64}\)
Step 1
Concept
जो संख्या वर्ग और घन दोनों हो, वह छठी घात होती है। / A number that is both a square and a cube is a sixth power.
Step 2
Why this answer is correct
(100) से छोटी छठी घातें \(1^6=1\) और \(2^6=64\) हैं। / Sixth powers less than (100) are \(1^6=1\) and \(2^6=64\).
Step 3
Exam Tip
दोनों शर्तों को अलग-अलग नहीं, साथ में पूरा करना होता है। / Both conditions must be satisfied together, not separately.
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