Class 11 Mathematics - Sets - Operations on Sets (Union, Intersection, Difference) Expert Quiz

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यदि \(U={1,2,\ldots,84}\), \(A={x:x\in U,;7\mid x}\) और \(B={x:x\in U,;12\mid x}\) हैं, तो \(|A\cup B|\) कितना है?

If \(U={1,2,\ldots,84}\), \(A={x:x\in U,;7\mid x}\) and \(B={x:x\in U,;12\mid x}\), what is \(|A\cup B|\)?

Explanation opens after your attempt
Correct Answer

A. (18)

Step 1

Concept

Here (|A|=12), (|B|=7) and \(|A\cap B|=1\), so \(|A\cup B|=18\). In such questions, use the least common multiple for common multiples.

Step 2

Why this answer is correct

The correct answer is A. (18). Here (|A|=12), (|B|=7) and \(|A\cap B|=1\), so \(|A\cup B|=18\). In such questions, use the least common multiple for common multiples.

Step 3

Exam Tip

(|A|=12), (|B|=7) और \(|A\cap B|=1\), इसलिए \(|A\cup B|=18\) है। ऐसे प्रश्नों में सामान्य गुणज के लिए लघुत्तम समापवर्त्य लें।

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यदि \(A={x:x\in\mathbb{N},;x\le 60,;4\mid x}\) और \(B={x:x\in\mathbb{N},;x\le 60,;6\mid x}\), तो \(|A\setminus B|\) कितना है?

If \(A={x:x\in\mathbb{N},;x\le 60,;4\mid x}\) and \(B={x:x\in\mathbb{N},;x\le 60,;6\mid x}\), what is \(|A\setminus B|\)?

Explanation opens after your attempt
Correct Answer

A. (10)

Step 1

Concept

The set (A) has (15) elements and \(A\cap B\) has (5) elements divisible by (12). So \(|A\setminus B|=15-5=10\).

Step 2

Why this answer is correct

The correct answer is A. (10). The set (A) has (15) elements and \(A\cap B\) has (5) elements divisible by (12). So \(|A\setminus B|=15-5=10\).

Step 3

Exam Tip

(A) में (15) तत्व हैं और \(A\cap B\) में (12) से विभाज्य (5) तत्व हैं। इसलिए \(|A\setminus B|=15-5=10\) है।

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यदि (A=[-4,6)) और (B=(-1,8]) हैं, तो \(A\setminus B\) क्या है?

If (A=[-4,6)) and (B=(-1,8]), what is \(A\setminus B\)?

Explanation opens after your attempt
Correct Answer

A. ([-4,-1])

Step 1

Concept

The point (-1) is not included in (B), so the part of (A) up to (-1) remains. Check open and closed endpoints separately in interval difference.

Step 2

Why this answer is correct

The correct answer is A. ([-4,-1]). The point (-1) is not included in (B), so the part of (A) up to (-1) remains. Check open and closed endpoints separately in interval difference.

Step 3

Exam Tip

(B) में (-1) शामिल नहीं है, इसलिए (A) का (-1) तक का भाग बचता है। अंतर निकालते समय खुले और बंद सिरों को अलग से जाँचें।

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यदि \(A\cup B=A\triangle B\), जहाँ (A\triangle B=\(A\setminus B\)\cup\(B\setminus A\)), तो कौन सा निष्कर्ष अवश्य सत्य है?

If \(A\cup B=A\triangle B\), where (A\triangle B=\(A\setminus B\)\cup\(B\setminus A\)), which conclusion must be true?

Explanation opens after your attempt
Correct Answer

B. \(A\cap B=\varnothing\)

Step 1

Concept

The symmetric difference does not include the common part. Therefore it can equal the union only when \(A\cap B=\varnothing\).

Step 2

Why this answer is correct

The correct answer is B. \(A\cap B=\varnothing\). The symmetric difference does not include the common part. Therefore it can equal the union only when \(A\cap B=\varnothing\).

Step 3

Exam Tip

सममित अंतर में सामान्य भाग शामिल नहीं होता। इसलिए संघ के बराबर होने के लिए \(A\cap B=\varnothing\) होना चाहिए।

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यदि \(A\cup B=U\), \(A\cap B=C\), और \(C\subseteq A\) है, तो \(A\setminus B\) किसके बराबर होगा?

If \(A\cup B=U\), \(A\cap B=C\), and \(C\subseteq A\), then \(A\setminus B\) is equal to which set?

Explanation opens after your attempt
Correct Answer

A. \(A\setminus C\)

Step 1

Concept

Since \(A\cap B=C\), removing (B) from (A) means removing the common part (C) from (A). In set difference, identify the intersection first.

Step 2

Why this answer is correct

The correct answer is A. \(A\setminus C\). Since \(A\cap B=C\), removing (B) from (A) means removing the common part (C) from (A). In set difference, identify the intersection first.

Step 3

Exam Tip

क्योंकि \(A\cap B=C\), इसलिए (A) से (B) हटाने का अर्थ (A) से उसका सामान्य भाग (C) हटाना है। सेट अंतर में पहले प्रतिच्छेद पहचानें।

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यदि (A=[-3,4]), (B=(-1,6)) और (C=[2,8]) हैं, तो (A\cap\(B\setminus C\)) क्या है?

If (A=[-3,4]), (B=(-1,6)) and (C=[2,8]), what is (A\cap\(B\setminus C\))?

Explanation opens after your attempt
Correct Answer

C. ((-1,2))

Step 1

Concept

First \(B\setminus C=(-1,2)\) because (2) is included in (C). Its intersection with (A) is also ((-1,2)).

Step 2

Why this answer is correct

The correct answer is C. ((-1,2)). First \(B\setminus C=(-1,2)\) because (2) is included in (C). Its intersection with (A) is also ((-1,2)).

Step 3

Exam Tip

पहले \(B\setminus C=(-1,2)\) है क्योंकि (2) (C) में शामिल है। इसका (A) से प्रतिच्छेद भी ((-1,2)) है।

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यदि \(|A\setminus B|=17\), \(|B\setminus A|=23\) और \(|A\cap B|=14\), तो \(|A\cup B|\) कितना होगा?

If \(|A\setminus B|=17\), \(|B\setminus A|=23\) and \(|A\cap B|=14\), what is \(|A\cup B|\)?

Explanation opens after your attempt
Correct Answer

A. (54)

Step 1

Concept

The union is the sum of three disjoint parts: (17+23+14=54). In a Venn diagram, add the separate regions directly.

Step 2

Why this answer is correct

The correct answer is A. (54). The union is the sum of three disjoint parts: (17+23+14=54). In a Venn diagram, add the separate regions directly.

Step 3

Exam Tip

संघ तीन अलग भागों का योग है: (17+23+14=54)। वेन आरेख में अलग क्षेत्रों को सीधे जोड़ें।

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यदि \(A\setminus B=B\) है, तो कौन सा निष्कर्ष अवश्य सत्य है?

If \(A\setminus B=B\), which conclusion must be true?

Explanation opens after your attempt
Correct Answer

A. \(B=\varnothing\)

Step 1

Concept

The set \(A\setminus B\) cannot contain any element of (B), so if it equals (B), then (B) must be empty. Use disjointness in such questions.

Step 2

Why this answer is correct

The correct answer is A. \(B=\varnothing\). The set \(A\setminus B\) cannot contain any element of (B), so if it equals (B), then (B) must be empty. Use disjointness in such questions.

Step 3

Exam Tip

\(A\setminus B\) में (B) का कोई तत्व नहीं हो सकता, इसलिए उसके (B) के बराबर होने पर (B) खाली होगा। ऐसे प्रश्नों में असंयुक्तता का उपयोग करें।

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यदि (A\cap\(B\cup C\)=A), तो कौन सा निष्कर्ष अवश्य सत्य है?

If (A\cap\(B\cup C\)=A), which conclusion must be true?

Explanation opens after your attempt
Correct Answer

A. \(A\subseteq B\cup C\)

Step 1

Concept

If the intersection of (A) with a set is (A) itself, then (A) is a subset of that set. Here the set is \(B\cup C\).

Step 2

Why this answer is correct

The correct answer is A. \(A\subseteq B\cup C\). If the intersection of (A) with a set is (A) itself, then (A) is a subset of that set. Here the set is \(B\cup C\).

Step 3

Exam Tip

किसी सेट (A) का किसी सेट से प्रतिच्छेद फिर (A) ही हो, तो (A) उस सेट का उपसमुच्चय होता है। यहाँ वह सेट \(B\cup C\) है।

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यदि \(A=\{2,4,6,8,10,12\}\), \(B=\{3,6,9,12,15\}\) और \(C=\{6,12,18\}\), तो (\(A\cup B\)\cap C) क्या है?

If \(A=\{2,4,6,8,10,12\}\), \(B=\{3,6,9,12,15\}\) and \(C=\{6,12,18\}\), what is (\(A\cup B\)\cap C)?

Explanation opens after your attempt
Correct Answer

A. ({6,12})

Step 1

Concept

The set \(A\cup B\) contains (6) and (12), but not (18). Hence the intersection with (C) is ({6,12}).

Step 2

Why this answer is correct

The correct answer is A. ({6,12}). The set \(A\cup B\) contains (6) and (12), but not (18). Hence the intersection with (C) is ({6,12}).

Step 3

Exam Tip

\(A\cup B\) में (6) और (12) दोनों हैं, पर (18) नहीं है। इसलिए (C) के साथ प्रतिच्छेद ({6,12}) है।

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यदि (|A|=41), (|B|=36) और \(|A\setminus B|=19\), तो \(|A\cup B|\) कितना है?

If (|A|=41), (|B|=36) and \(|A\setminus B|=19\), what is \(|A\cup B|\)?

Explanation opens after your attempt
Correct Answer

A. (55)

Step 1

Concept

Here \(|A\cap B|=41-19=22\), so \(|A\cup B|=41+36-22=55\). Finding the common part first is essential.

Step 2

Why this answer is correct

The correct answer is A. (55). Here \(|A\cap B|=41-19=22\), so \(|A\cup B|=41+36-22=55\). Finding the common part first is essential.

Step 3

Exam Tip

\(|A\cap B|=41-19=22\), इसलिए \(|A\cup B|=41+36-22=55\)। पहले सामान्य भाग निकालना आवश्यक है।

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यदि (A\triangle B=\(A\setminus B\)\cup\(B\setminus A\)), \(|A\triangle B|=34\) और \(|A\cup B|=51\), तो \(|A\cap B|\) कितना है?

If (A\triangle B=\(A\setminus B\)\cup\(B\setminus A\)), \(|A\triangle B|=34\) and \(|A\cup B|=51\), what is \(|A\cap B|\)?

Explanation opens after your attempt
Correct Answer

A. (17)

Step 1

Concept

The union is made of the symmetric difference and the common part, so \(|A\cap B|=51-34=17\). Keep Venn regions separate.

Step 2

Why this answer is correct

The correct answer is A. (17). The union is made of the symmetric difference and the common part, so \(|A\cap B|=51-34=17\). Keep Venn regions separate.

Step 3

Exam Tip

संघ सममित अंतर और सामान्य भाग से बनता है, इसलिए \(|A\cap B|=51-34=17\)। वेन आरेख में क्षेत्रों को अलग रखें।

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यदि \(A\subseteq B\) और \(C\subseteq D\), तो कौन सा समावेशन अवश्य सत्य है?

If \(A\subseteq B\) and \(C\subseteq D\), which inclusion must be true?

Explanation opens after your attempt
Correct Answer

A. \(A\cup C\subseteq B\cup D\)

Step 1

Concept

Every element of (A) is in (B), and every element of (C) is in (D). Therefore inclusion is preserved under union.

Step 2

Why this answer is correct

The correct answer is A. \(A\cup C\subseteq B\cup D\). Every element of (A) is in (B), and every element of (C) is in (D). Therefore inclusion is preserved under union.

Step 3

Exam Tip

(A) का हर तत्व (B) में और (C) का हर तत्व (D) में है। इसलिए उनके संघ में भी समावेशन बना रहता है।

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यदि \(A\cup B=A\) और \(A\setminus B=\varnothing\), तो कौन सा निष्कर्ष सही है?

If \(A\cup B=A\) and \(A\setminus B=\varnothing\), which conclusion is correct?

Explanation opens after your attempt
Correct Answer

A. (A=B)

Step 1

Concept

The first condition gives \(B\subseteq A\), and the second gives \(A\subseteq B\). Together they imply (A=B).

Step 2

Why this answer is correct

The correct answer is A. (A=B). The first condition gives \(B\subseteq A\), and the second gives \(A\subseteq B\). Together they imply (A=B).

Step 3

Exam Tip

पहली शर्त से \(B\subseteq A\) और दूसरी से \(A\subseteq B\) मिलता है। दोनों मिलकर (A=B) देते हैं।

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यदि \(A={x:x\in\mathbb{N},;x\le 40,;x is a square}\) और (B={x:x\in\mathbb{N},;x\le 40,;\(2\mid x}), तो (A\cap B) क्या है\)?

If \(A={x:x\in\mathbb{N},;x\le 40,;x is a square}\) and (B={x:x\in\mathbb{N},;x\le 40,;\(2\mid x}), what is (A\cap B)\)?

Explanation opens after your attempt
Correct Answer

A. ({4,16,36})

Step 1

Concept

The square numbers up to (40) are (1,4,9,16,25,36). Among them, the even squares are (4,16,36).

Step 2

Why this answer is correct

The correct answer is A. ({4,16,36}). The square numbers up to (40) are (1,4,9,16,25,36). Among them, the even squares are (4,16,36).

Step 3

Exam Tip

(40) तक वर्ग संख्याएँ (1,4,9,16,25,36) हैं। इनमें सम वर्ग (4,16,36) हैं।

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यदि \(A\cap B=B\cap C=C\cap A=\varnothing\), (|A|=9), (|B|=11), (|C|=13), तो \(|A\cup B\cup C|\) क्या है?

If \(A\cap B=B\cap C=C\cap A=\varnothing\), (|A|=9), (|B|=11), (|C|=13), what is \(|A\cup B\cup C|\)?

Explanation opens after your attempt
Correct Answer

A. (33)

Step 1

Concept

The three sets are pairwise disjoint, so the union has (9+11+13=33) elements. No subtraction is needed for disjoint sets.

Step 2

Why this answer is correct

The correct answer is A. (33). The three sets are pairwise disjoint, so the union has (9+11+13=33) elements. No subtraction is needed for disjoint sets.

Step 3

Exam Tip

तीनों सेट परस्पर असंयुक्त हैं, इसलिए संघ की संख्या (9+11+13=33) है। असंयुक्त सेटों में कोई घटाव नहीं होता।

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यदि (A\setminus\(B\cap C\)=\varnothing), तो कौन सा कथन अवश्य सत्य है?

If (A\setminus\(B\cap C\)=\varnothing), which statement must be true?

Explanation opens after your attempt
Correct Answer

A. \(A\subseteq B\cap C\)

Step 1

Concept

Nothing remains after removing \(B\cap C\) from (A), so all of (A) lies inside \(B\cap C\). Identify subset relations from empty difference.

Step 2

Why this answer is correct

The correct answer is A. \(A\subseteq B\cap C\). Nothing remains after removing \(B\cap C\) from (A), so all of (A) lies inside \(B\cap C\). Identify subset relations from empty difference.

Step 3

Exam Tip

(A) से \(B\cap C\) हटाने पर कुछ नहीं बचा, इसका अर्थ है (A) पूरा \(B\cap C\) में है। शून्य अंतर से उपसमुच्चय पहचानें।

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यदि \(A=\{1,2,3,4,5,6\}\), \(B=\{2,4,6,8\}\) और \(C=\{1,4,6,9\}\), तो (A\setminus\(B\cap C\)) क्या है?

If \(A=\{1,2,3,4,5,6\}\), \(B=\{2,4,6,8\}\) and \(C=\{1,4,6,9\}\), what is (A\setminus\(B\cap C\))?

Explanation opens after your attempt
Correct Answer

A. ({1,2,3,5})

Step 1

Concept

Here \(B\cap C={4,6}\). Removing these from (A) leaves ({1,2,3,5}).

Step 2

Why this answer is correct

The correct answer is A. ({1,2,3,5}). Here \(B\cap C={4,6}\). Removing these from (A) leaves ({1,2,3,5}).

Step 3

Exam Tip

\(B\cap C={4,6}\) है। इन्हें (A) से हटाने पर ({1,2,3,5}) बचता है।

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यदि (\(A\setminus B\)\cup\(A\cap B\)=A) का उपयोग किया जाए, तो (A) के ये दोनों भाग कैसे हैं?

Using (\(A\setminus B\)\cup\(A\cap B\)=A), how are these two parts of (A) related?

Explanation opens after your attempt
Correct Answer

A. वे असंयुक्त हैंThey are disjoint

Step 1

Concept

The set \(A\setminus B\) has elements of (A) outside (B), while \(A\cap B\) has elements of (A) inside (B). So they have no common element.

Step 2

Why this answer is correct

The correct answer is A. वे असंयुक्त हैं / They are disjoint. The set \(A\setminus B\) has elements of (A) outside (B), while \(A\cap B\) has elements of (A) inside (B). So they have no common element.

Step 3

Exam Tip

\(A\setminus B\) में (B) के बाहर वाले तत्व हैं और \(A\cap B\) में (B) के अंदर वाले तत्व हैं। इसलिए दोनों में कोई सामान्य तत्व नहीं होता।

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यदि \(A\cup B=B\cup C\) और \(A\cap B=B\cap C\), तो कौन सा निष्कर्ष अवश्य सत्य है?

If \(A\cup B=B\cup C\) and \(A\cap B=B\cap C\), which conclusion must be true?

Explanation opens after your attempt
Correct Answer

A. (A=C)

Step 1

Concept

Equal union and equal intersection make membership of (A) and (C) the same both inside and outside (B). Hence (A=C).

Step 2

Why this answer is correct

The correct answer is A. (A=C). Equal union and equal intersection make membership of (A) and (C) the same both inside and outside (B). Hence (A=C).

Step 3

Exam Tip

समान संघ और समान प्रतिच्छेद में (B) के अंदर तथा बाहर दोनों जगह (A) और (C) की सदस्यता समान होती है। इसलिए (A=C) है।

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यदि (A) और (B) सीमित सेट हैं, \(|A\cup B|=65\), \(|A\cap B|=18\), और (|A|=39), तो \(|B\setminus A|\) कितना है?

If (A) and (B) are finite sets, \(|A\cup B|=65\), \(|A\cap B|=18\), and (|A|=39), what is \(|B\setminus A|\)?

Explanation opens after your attempt
Correct Answer

A. (26)

Step 1

Concept

The number in \(A\setminus B\) is (39-18=21). Since the part outside (A) in the union is (65-39=26), \(|B\setminus A|=26\).

Step 2

Why this answer is correct

The correct answer is A. (26). The number in \(A\setminus B\) is (39-18=21). Since the part outside (A) in the union is (65-39=26), \(|B\setminus A|=26\).

Step 3

Exam Tip

\(A\setminus B\) की संख्या (39-18=21) है। संघ से (A) का यह भाग और सामान्य भाग हटाने पर (65-39=26) मिलता है।

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यदि \(A={x:x\in\mathbb{R},;x^2-9=0}\) और \(B={x:x\in\mathbb{R},;x^2-6x+9=0}\), तो \(A\cup B\) क्या है?

If \(A={x:x\in\mathbb{R},;x^2-9=0}\) and \(B={x:x\in\mathbb{R},;x^2-6x+9=0}\), what is \(A\cup B\)?

Explanation opens after your attempt
Correct Answer

A. ({-3,3})

Step 1

Concept

First \(A=\{-3,3\}\) and \(B=\{3\}\). The union removes repetition and gives ({-3,3}).

Step 2

Why this answer is correct

The correct answer is A. ({-3,3}). First \(A=\{-3,3\}\) and \(B=\{3\}\). The union removes repetition and gives ({-3,3}).

Step 3

Exam Tip

पहले \(A=\{-3,3\}\) और \(B=\{3\}\) है। संघ में दोहराव हटाकर ({-3,3}) मिलता है।

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यदि \(A\subseteq B\), तो (\(C\setminus B\)\cap A) क्या होगा?

If \(A\subseteq B\), what is (\(C\setminus B\)\cap A)?

Explanation opens after your attempt
Correct Answer

A. \(\varnothing\)

Step 1

Concept

The set \(C\setminus B\) has elements outside (B), while all of (A) lies inside (B). Hence their intersection is empty.

Step 2

Why this answer is correct

The correct answer is A. \(\varnothing\). The set \(C\setminus B\) has elements outside (B), while all of (A) lies inside (B). Hence their intersection is empty.

Step 3

Exam Tip

\(C\setminus B\) में (B) के बाहर के तत्व हैं, जबकि (A) पूरा (B) के अंदर है। इसलिए दोनों का प्रतिच्छेद खाली है।

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किस स्थिति में \(A\setminus B=A\cap B\) सत्य हो सकता है?

In which situation can \(A\setminus B=A\cap B\) be true?

Explanation opens after your attempt
Correct Answer

A. \(A=\varnothing\)

Step 1

Concept

The sets \(A\setminus B\) and \(A\cap B\) are disjoint, so if they are equal, both must be empty. This gives \(A=\varnothing\).

Step 2

Why this answer is correct

The correct answer is A. \(A=\varnothing\). The sets \(A\setminus B\) and \(A\cap B\) are disjoint, so if they are equal, both must be empty. This gives \(A=\varnothing\).

Step 3

Exam Tip

\(A\setminus B\) और \(A\cap B\) असंयुक्त होते हैं, इसलिए बराबर होने पर दोनों खाली होंगे। इससे \(A=\varnothing\) मिलता है।

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यदि \(A\cap B\subseteq A\setminus C\), तो कौन सा कथन अवश्य सत्य है?

If \(A\cap B\subseteq A\setminus C\), which statement must be true?

Explanation opens after your attempt
Correct Answer

A. \(A\cap B\cap C=\varnothing\)

Step 1

Concept

The set \(A\setminus C\) contains no element of (C). Therefore no element of \(A\cap B\) can lie in (C).

Step 2

Why this answer is correct

The correct answer is A. \(A\cap B\cap C=\varnothing\). The set \(A\setminus C\) contains no element of (C). Therefore no element of \(A\cap B\) can lie in (C).

Step 3

Exam Tip

\(A\setminus C\) में (C) का कोई तत्व नहीं होता। इसलिए \(A\cap B\) का कोई तत्व (C) में नहीं होगा।

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यदि \(A=\{1,2,4,8,16,32\}\) और \(B={x:x\in A,;x<10}\), तो \(A\setminus B\) क्या है?

If \(A=\{1,2,4,8,16,32\}\) and \(B={x:x\in A,;x<10}\), what is \(A\setminus B\)?

Explanation opens after your attempt
Correct Answer

A. ({16,32})

Step 1

Concept

Here \(B=\{1,2,4,8\}\). Removing (B) from (A) leaves ({16,32}).

Step 2

Why this answer is correct

The correct answer is A. ({16,32}). Here \(B=\{1,2,4,8\}\). Removing (B) from (A) leaves ({16,32}).

Step 3

Exam Tip

\(B=\{1,2,4,8\}\) है। (A) से (B) हटाने पर ({16,32}) बचता है।

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यदि \(A\cup B=A\cap C\), तो कौन सा निष्कर्ष अवश्य सत्य है?

If \(A\cup B=A\cap C\), which conclusion must be true?

Explanation opens after your attempt
Correct Answer

A. \(B\subseteq A\) और \(A\subseteq C\)\(B\subseteq A\) and \(A\subseteq C\)

Step 1

Concept

The right side is a subset of (A), so \(A\cup B\subseteq A\) gives \(B\subseteq A\). Also \(A\subseteq A\cup B=A\cap C\), so \(A\subseteq C\).

Step 2

Why this answer is correct

The correct answer is A. \(B\subseteq A\) और \(A\subseteq C\) / \(B\subseteq A\) and \(A\subseteq C\). The right side is a subset of (A), so \(A\cup B\subseteq A\) gives \(B\subseteq A\). Also \(A\subseteq A\cup B=A\cap C\), so \(A\subseteq C\).

Step 3

Exam Tip

दायाँ पक्ष (A) का उपसमुच्चय है, इसलिए \(A\cup B\subseteq A\) से \(B\subseteq A\) मिलता है। साथ ही \(A\subseteq A\cup B=A\cap C\), इसलिए \(A\subseteq C\) है।

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यदि \(U={1,2,\ldots,50}\), \(A={x:x\in U,;2\mid x}\), \(B={x:x\in U,;5\mid x}\), तो \(A\setminus B\) में कितने तत्व हैं?

If \(U={1,2,\ldots,50}\), \(A={x:x\in U,;2\mid x}\), \(B={x:x\in U,;5\mid x}\), how many elements are in \(A\setminus B\)?

Explanation opens after your attempt
Correct Answer

A. (20)

Step 1

Concept

There are (25) even numbers in (A), and (5) of them are also divisible by (10). Therefore (25-5=20) elements remain.

Step 2

Why this answer is correct

The correct answer is A. (20). There are (25) even numbers in (A), and (5) of them are also divisible by (10). Therefore (25-5=20) elements remain.

Step 3

Exam Tip

(A) में (25) सम संख्याएँ हैं और (10) से विभाज्य (5) संख्याएँ (B) में भी हैं। इसलिए (25-5=20) तत्व बचते हैं।

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यदि \(A\cap B=\varnothing\) और \(A\cup B=A\cup C\), तो कौन सा निष्कर्ष अवश्य सत्य है?

If \(A\cap B=\varnothing\) and \(A\cup B=A\cup C\), which conclusion must be true?

Explanation opens after your attempt
Correct Answer

A. \(B\setminus C\subseteq A\)

Step 1

Concept

If \(x\in B\setminus C\), then \(x\in A\cup C\) and \(x\notin C\), so \(x\in A\). Membership reasoning helps in such conclusions.

Step 2

Why this answer is correct

The correct answer is A. \(B\setminus C\subseteq A\). If \(x\in B\setminus C\), then \(x\in A\cup C\) and \(x\notin C\), so \(x\in A\). Membership reasoning helps in such conclusions.

Step 3

Exam Tip

यदि \(x\in B\setminus C\), तो \(x\in A\cup C\) होना चाहिए और \(x\notin C\), इसलिए \(x\in A\) है। सदस्यता तर्क ऐसे निष्कर्षों में सहायक है।

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यदि \(A=\{a,b,c,d,e\}\), \(B=\{b,d,f,g\}\), और \(C=\{a,d,g,h\}\), तो (\(A\cap C\)\cup\(B\setminus A\)) क्या है?

If \(A=\{a,b,c,d,e\}\), \(B=\{b,d,f,g\}\), and \(C=\{a,d,g,h\}\), what is (\(A\cap C\)\cup\(B\setminus A\))?

Explanation opens after your attempt
Correct Answer

A. ({a,d,f,g})

Step 1

Concept

Here \(A\cap C={a,d}\) and \(B\setminus A={f,g}\). Their union is ({a,d,f,g}).

Step 2

Why this answer is correct

The correct answer is A. ({a,d,f,g}). Here \(A\cap C={a,d}\) and \(B\setminus A={f,g}\). Their union is ({a,d,f,g}).

Step 3

Exam Tip

\(A\cap C={a,d}\) और \(B\setminus A={f,g}\) है। उनका संघ ({a,d,f,g}) है।

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यदि (|A|=30), (|B|=27), (|C|=25), \(|A\cap B|=12\), \(|B\cap C|=10\), \(|C\cap A|=8\), \(|A\cap B\cap C|=4\), तो \(|A\cup B\cup C|\) क्या है?

If (|A|=30), (|B|=27), (|C|=25), \(|A\cap B|=12\), \(|B\cap C|=10\), \(|C\cap A|=8\), \(|A\cap B\cap C|=4\), what is \(|A\cup B\cup C|\)?

Explanation opens after your attempt
Correct Answer

A. (56)

Step 1

Concept

Here \(|A\cup B\cup C|=30+27+25-12-10-8+4=56\). Do not forget to add the triple intersection in the three-set formula.

Step 2

Why this answer is correct

The correct answer is A. (56). Here \(|A\cup B\cup C|=30+27+25-12-10-8+4=56\). Do not forget to add the triple intersection in the three-set formula.

Step 3

Exam Tip

\(|A\cup B\cup C|=30+27+25-12-10-8+4=56\)। तीन सेटों के सूत्र में अंतिम प्रतिच्छेद जोड़ना न भूलें।

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यदि \(A\setminus B=C\setminus B\) और \(A\cap B=C\cap B\), तो क्या निष्कर्ष है?

If \(A\setminus B=C\setminus B\) and \(A\cap B=C\cap B\), what is the conclusion?

Explanation opens after your attempt
Correct Answer

A. (A=C)

Step 1

Concept

Any set (A) can be split into \(A\setminus B\) and \(A\cap B\). Since both parts match those of (C), (A=C).

Step 2

Why this answer is correct

The correct answer is A. (A=C). Any set (A) can be split into \(A\setminus B\) and \(A\cap B\). Since both parts match those of (C), (A=C).

Step 3

Exam Tip

किसी भी सेट (A) को \(A\setminus B\) और \(A\cap B\) में बाँटा जा सकता है। दोनों भाग (C) के समान हैं, इसलिए (A=C) है।

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यदि (A\setminus\(B\setminus C\)=A), तो कौन सा समावेशन अवश्य सत्य है?

If (A\setminus\(B\setminus C\)=A), which inclusion must be true?

Explanation opens after your attempt
Correct Answer

A. \(A\cap B\subseteq C\)

Step 1

Concept

Removing \(B\setminus C\) from (A) changes nothing, so (A\cap\(B\setminus C\)=\varnothing). Hence elements of \(A\cap B\) must lie in (C).

Step 2

Why this answer is correct

The correct answer is A. \(A\cap B\subseteq C\). Removing \(B\setminus C\) from (A) changes nothing, so (A\cap\(B\setminus C\)=\varnothing). Hence elements of \(A\cap B\) must lie in (C).

Step 3

Exam Tip

(A) से \(B\setminus C\) हटाने पर कुछ नहीं घटा, इसलिए (A\cap\(B\setminus C\)=\varnothing)। अतः \(A\cap B\) के तत्व (C) में होंगे।

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यदि (A=\(-\infty,3]\) और (B=[0,5)), तो \(A\cap B\) क्या है?

If (A=\(-\infty,3]\) and (B=[0,5)), what is \(A\cap B\)?

Explanation opens after your attempt
Correct Answer

A. ([0,3])

Step 1

Concept

The common part of the two intervals is from (0) to (3), and both endpoints are included. In intersection, take only the shared part.

Step 2

Why this answer is correct

The correct answer is A. ([0,3]). The common part of the two intervals is from (0) to (3), and both endpoints are included. In intersection, take only the shared part.

Step 3

Exam Tip

दोनों अंतरालों में सामान्य भाग (0) से (3) तक है और दोनों सिरे शामिल हैं। प्रतिच्छेद में साझा भाग ही लें।

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यदि \(A\cap B=A\cap C\) और \(A\setminus B=A\setminus C\), तो कौन सा निष्कर्ष अवश्य सत्य है?

If \(A\cap B=A\cap C\) and \(A\setminus B=A\setminus C\), which conclusion must be true?

Explanation opens after your attempt
Correct Answer

A. (A\cap\(B\triangle C\)=\varnothing)

Step 1

Concept

Both conditions show that inside (A), membership in (B) and (C) is the same. Therefore (A) contains no element of \(B\triangle C\).

Step 2

Why this answer is correct

The correct answer is A. (A\cap\(B\triangle C\)=\varnothing). Both conditions show that inside (A), membership in (B) and (C) is the same. Therefore (A) contains no element of \(B\triangle C\).

Step 3

Exam Tip

दोनों शर्तें बताती हैं कि (A) के अंदर (B) और (C) की सदस्यता समान है। इसलिए (A) में \(B\triangle C\) का कोई तत्व नहीं है।

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एक सर्वे में (150) लोगों में से (88) चाय सेट (T) में, (76) कॉफी सेट (C) में और (39) दोनों में हैं। केवल चाय पीने वाले कितने हैं?

In a survey of (150) people, (88) are in tea set (T), (76) are in coffee set (C), and (39) are in both. How many drink only tea?

Explanation opens after your attempt
Correct Answer

A. (49)

Step 1

Concept

Only tea means \(|T\setminus C|=|T|-|T\cap C|=88-39=49\). In only-type questions, subtract the intersection.

Step 2

Why this answer is correct

The correct answer is A. (49). Only tea means \(|T\setminus C|=|T|-|T\cap C|=88-39=49\). In only-type questions, subtract the intersection.

Step 3

Exam Tip

केवल चाय का अर्थ \(|T\setminus C|=|T|-|T\cap C|=88-39=49\) है। केवल वाले प्रश्नों में प्रतिच्छेद घटाएँ।

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यदि \(A\cup B=A\) और \(B\cup C=C\), तो कौन सा संबंध अवश्य सत्य है?

If \(A\cup B=A\) and \(B\cup C=C\), which relation must be true?

Explanation opens after your attempt
Correct Answer

A. \(B\subseteq A\cap C\)

Step 1

Concept

The first condition gives \(B\subseteq A\), and the second gives \(B\subseteq C\). Hence \(B\subseteq A\cap C\).

Step 2

Why this answer is correct

The correct answer is A. \(B\subseteq A\cap C\). The first condition gives \(B\subseteq A\), and the second gives \(B\subseteq C\). Hence \(B\subseteq A\cap C\).

Step 3

Exam Tip

पहली शर्त से \(B\subseteq A\) और दूसरी से \(B\subseteq C\) है। इसलिए \(B\subseteq A\cap C\) है।

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यदि \(A={x:x\in\mathbb{N},;x\le 25,;x is odd}\) और (B={x:x\in\mathbb{N},;x\le 25,;\(3\mid x}), तो (|A\cap B|) कितना है\)?

If \(A={x:x\in\mathbb{N},;x\le 25,;x is odd}\) and (B={x:x\in\mathbb{N},;x\le 25,;\(3\mid x}), what is (|A\cap B|)\)?

Explanation opens after your attempt
Correct Answer

A. (5)

Step 1

Concept

Multiples of (3) up to (25) are (3,6,9,12,15,18,21,24). The odd ones are (3,9,15,21), so the count is (4).

Step 2

Why this answer is correct

The correct answer is A. (5). Multiples of (3) up to (25) are (3,6,9,12,15,18,21,24). The odd ones are (3,9,15,21), so the count is (4).

Step 3

Exam Tip

(25) तक (3) के गुणज (3,6,9,12,15,18,21,24) हैं। इनमें विषम (3,9,15,21,25) नहीं, बल्कि (3,9,15,21) और (?) नहीं; कुल (4) है।

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यदि \(A\setminus C=B\setminus C\), तो कौन सा कथन सदैव सत्य है?

If \(A\setminus C=B\setminus C\), which statement is always true?

Explanation opens after your attempt
Correct Answer

A. (A\setminus\(B\cup C\)=\varnothing) और (B\setminus\(A\cup C\)=\varnothing)(A\setminus\(B\cup C\)=\varnothing) and (B\setminus\(A\cup C\)=\varnothing)

Step 1

Concept

Outside (C), the elements of (A) and (B) are the same. Hence no element of (A) lies outside both (B) and (C), and similarly for (B).

Step 2

Why this answer is correct

The correct answer is A. (A\setminus\(B\cup C\)=\varnothing) और (B\setminus\(A\cup C\)=\varnothing) / (A\setminus\(B\cup C\)=\varnothing) and (B\setminus\(A\cup C\)=\varnothing). Outside (C), the elements of (A) and (B) are the same. Hence no element of (A) lies outside both (B) and (C), and similarly for (B).

Step 3

Exam Tip

(C) के बाहर (A) और (B) के तत्व समान हैं। इसलिए (A) का (B) और (C) दोनों से बाहर कोई तत्व नहीं और वैसा ही (B) के लिए है।

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यदि (\mathcal{P}\(A\cap B\)={\varnothing}), तो \(A\cap B\) क्या होगा?

If (\mathcal{P}\(A\cap B\)={\varnothing}), what is \(A\cap B\)?

Explanation opens after your attempt
Correct Answer

A. \(\varnothing\)

Step 1

Concept

The power set of a set is only \({\varnothing}\) exactly when the original set is \(\varnothing\). Therefore \(A\cap B=\varnothing\).

Step 2

Why this answer is correct

The correct answer is A. \(\varnothing\). The power set of a set is only \({\varnothing}\) exactly when the original set is \(\varnothing\). Therefore \(A\cap B=\varnothing\).

Step 3

Exam Tip

किसी सेट का पावर सेट केवल \({\varnothing}\) तभी होता है जब मूल सेट \(\varnothing\) हो। इसलिए \(A\cap B=\varnothing\) है।

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यदि \(A\setminus B\subseteq A\cap C\), तो कौन सा निष्कर्ष अवश्य सत्य है?

If \(A\setminus B\subseteq A\cap C\), which conclusion must be true?

Explanation opens after your attempt
Correct Answer

A. \(A\setminus B\subseteq C\)

Step 1

Concept

If a set is a subset of \(A\cap C\), then it is also a subset of (C). Hence \(A\setminus B\subseteq C\).

Step 2

Why this answer is correct

The correct answer is A. \(A\setminus B\subseteq C\). If a set is a subset of \(A\cap C\), then it is also a subset of (C). Hence \(A\setminus B\subseteq C\).

Step 3

Exam Tip

यदि कोई सेट \(A\cap C\) का उपसमुच्चय है, तो वह (C) का भी उपसमुच्चय होगा। इसलिए \(A\setminus B\subseteq C\) है।

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यदि \(A=\{1,3,5,7,9,11\}\), \(B=\{3,6,9,12\}\), \(C=\{5,9,13\}\), तो (\(A\setminus B\)\cap C) क्या है?

If \(A=\{1,3,5,7,9,11\}\), \(B=\{3,6,9,12\}\), \(C=\{5,9,13\}\), what is (\(A\setminus B\)\cap C)?

Explanation opens after your attempt
Correct Answer

A. ({5})

Step 1

Concept

Here \(A\setminus B={1,5,7,11}\). Its only common element with (C) is (5).

Step 2

Why this answer is correct

The correct answer is A. ({5}). Here \(A\setminus B={1,5,7,11}\). Its only common element with (C) is (5).

Step 3

Exam Tip

\(A\setminus B={1,5,7,11}\) है। इसका (C) के साथ सामान्य तत्व केवल (5) है।

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यदि (A\cup\(B\cap C\)=A) है, तो कौन सा समावेशन अवश्य सत्य है?

If (A\cup\(B\cap C\)=A), which inclusion must be true?

Explanation opens after your attempt
Correct Answer

A. \(B\cap C\subseteq A\)

Step 1

Concept

If adding a set to (A) by union still gives (A), that set is a subset of (A). Here that set is \(B\cap C\).

Step 2

Why this answer is correct

The correct answer is A. \(B\cap C\subseteq A\). If adding a set to (A) by union still gives (A), that set is a subset of (A). Here that set is \(B\cap C\).

Step 3

Exam Tip

किसी सेट को (A) से जोड़ने पर परिणाम (A) ही रहे, तो वह सेट (A) का उपसमुच्चय होता है। यहाँ वह \(B\cap C\) है।

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यदि (A=[1,10]), (B=[3,7]), और (C=(5,12)), तो (A\setminus\(B\cup C\)) क्या है?

If (A=[1,10]), (B=[3,7]), and (C=(5,12)), what is (A\setminus\(B\cup C\))?

Explanation opens after your attempt
Correct Answer

A. ([1,3))

Step 1

Concept

Here \(B\cup C=[3,12\)). Removing it from (A) leaves ([1,3)) because (3) is removed.

Step 2

Why this answer is correct

The correct answer is A. ([1,3)). Here \(B\cup C=[3,12\)). Removing it from (A) leaves ([1,3)) because (3) is removed.

Step 3

Exam Tip

\(B\cup C=[3,12\)) है। इसे (A) से हटाने पर ([1,3)) बचता है क्योंकि (3) हट जाता है।

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यदि \(|A\cup B|=92\), \(|A\setminus B|=31\), और \(|A\cap B|=27\), तो (|B|) कितना है?

If \(|A\cup B|=92\), \(|A\setminus B|=31\), and \(|A\cap B|=27\), what is (|B|)?

Explanation opens after your attempt
Correct Answer

A. (61)

Step 1

Concept

The union has \(A\setminus B\), \(A\cap B\), and \(B\setminus A\). Here \(B\setminus A=92-31-27=34\), so (|B|=34+27=61).

Step 2

Why this answer is correct

The correct answer is A. (61). The union has \(A\setminus B\), \(A\cap B\), and \(B\setminus A\). Here \(B\setminus A=92-31-27=34\), so (|B|=34+27=61).

Step 3

Exam Tip

संघ में \(A\setminus B\), \(A\cap B\) और \(B\setminus A\) हैं। \(B\setminus A=92-31-27=34\), इसलिए (|B|=34+27=61)।

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यदि \(A\setminus B=A\setminus C\) और \(B\subseteq C\), तो कौन सा निष्कर्ष अवश्य सत्य है?

If \(A\setminus B=A\setminus C\) and \(B\subseteq C\), which conclusion must be true?

Explanation opens after your attempt
Correct Answer

A. (A\cap \(C\subseteq B\)\cup\(A^c\))

Step 1

Concept

Inside (A), the parts outside (B) and outside (C) are equal. Thus (A\cap\(C\setminus B\)) is empty, which is equivalent to the given inclusion.

Step 2

Why this answer is correct

The correct answer is A. (A\cap \(C\subseteq B\)\cup\(A^c\)). Inside (A), the parts outside (B) and outside (C) are equal. Thus (A\cap\(C\setminus B\)) is empty, which is equivalent to the given inclusion.

Step 3

Exam Tip

(A) के अंदर (B) से बाहर और (C) से बाहर भाग समान हैं। इसलिए (A\cap\(C\setminus B\)) खाली है, जो दिए गए समावेशन के बराबर है।

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कौन सा कथन (\(A\cup B\)\cap\(A\setminus B\)) के बराबर है?

Which expression is equal to (\(A\cup B\)\cap\(A\setminus B\))?

Explanation opens after your attempt
Correct Answer

A. \(A\setminus B\)

Step 1

Concept

Every element of \(A\setminus B\) lies in (A), so it also lies in \(A\cup B\). Therefore the intersection remains \(A\setminus B\).

Step 2

Why this answer is correct

The correct answer is A. \(A\setminus B\). Every element of \(A\setminus B\) lies in (A), so it also lies in \(A\cup B\). Therefore the intersection remains \(A\setminus B\).

Step 3

Exam Tip

\(A\setminus B\) का हर तत्व (A) में है, इसलिए वह \(A\cup B\) में भी है। अतः प्रतिच्छेद वही \(A\setminus B\) रहेगा।

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यदि (A), (B), (C) सीमित सेट हैं और \(A\cap B\cap C=\varnothing\), तो \(|A\cup B\cup C|\) के लिए सही सूत्र कौन सा है?

If (A), (B), (C) are finite sets and \(A\cap B\cap C=\varnothing\), which formula for \(|A\cup B\cup C|\) is correct?

Explanation opens after your attempt
Correct Answer

A. \(|A|+|B|+|C|-|A\cap B|-|B\cap C|-|C\cap A|\)

Step 1

Concept

In the three-set formula, \(|A\cap B\cap C|\) is added at the end, but here it is (0). So only pairwise intersections are subtracted.

Step 2

Why this answer is correct

The correct answer is A. \(|A|+|B|+|C|-|A\cap B|-|B\cap C|-|C\cap A|\). In the three-set formula, \(|A\cap B\cap C|\) is added at the end, but here it is (0). So only pairwise intersections are subtracted.

Step 3

Exam Tip

तीन सेटों के सूत्र में अंत में \(|A\cap B\cap C|\) जोड़ा जाता है, पर यहाँ वह (0) है। इसलिए केवल युग्म प्रतिच्छेद घटते हैं।

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यदि \(A\setminus B\ne\varnothing\) और \(B\setminus A=\varnothing\), तो कौन सा कथन सही है?

If \(A\setminus B\ne\varnothing\) and \(B\setminus A=\varnothing\), which statement is correct?

Explanation opens after your attempt
Correct Answer

A. \(B\subset A\)

Step 1

Concept

From \(B\setminus A=\varnothing\), \(B\subseteq A\), and from \(A\setminus B\ne\varnothing\), \(A\ne B\). Hence \(B\subset A\).

Step 2

Why this answer is correct

The correct answer is A. \(B\subset A\). From \(B\setminus A=\varnothing\), \(B\subseteq A\), and from \(A\setminus B\ne\varnothing\), \(A\ne B\). Hence \(B\subset A\).

Step 3

Exam Tip

\(B\setminus A=\varnothing\) से \(B\subseteq A\) है और \(A\setminus B\ne\varnothing\) से \(A\ne B\)। इसलिए \(B\subset A\) है।

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यदि (A\cap\(B\setminus C\)=A\cap B), तो कौन सा निष्कर्ष अवश्य सत्य है?

If (A\cap\(B\setminus C\)=A\cap B), which conclusion must be true?

Explanation opens after your attempt
Correct Answer

A. \(A\cap B\cap C=\varnothing\)

Step 1

Concept

The left side cannot contain elements of (C), yet it equals \(A\cap B\). Therefore no element of \(A\cap B\) lies in (C).

Step 2

Why this answer is correct

The correct answer is A. \(A\cap B\cap C=\varnothing\). The left side cannot contain elements of (C), yet it equals \(A\cap B\). Therefore no element of \(A\cap B\) lies in (C).

Step 3

Exam Tip

बाएँ पक्ष में (C) के तत्व नहीं हो सकते, फिर भी वह \(A\cap B\) के बराबर है। इसलिए \(A\cap B\) का कोई तत्व (C) में नहीं है।

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FAQs

Class 11 Mathematics Quiz FAQs

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