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Class 11 Mathematics Hard Quiz

Level 30 • 50/50 questions • 30 seconds per question.

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Question 1 / 50 0 score
Answered 0/50 Correct 0 Time 25:00

यदि \(A=\{1,2,3\}\) और \(B=\{a,b\}\) हों, तो संबंध \(R=\{(1,a),(2,b),(3,a),(2,a)\}\) के बारे में सही कथन कौन सा है?

If \(A=\{1,2,3\}\) and \(B=\{a,b\}\), which statement about the relation \(R=\{(1,a),(2,b),(3,a),(2,a)\}\) is correct?

Explanation opens after your attempt
Correct Answer

B. यह फलन नहीं है क्योंकि (2) की दो छवियां हैंIt is not a function because (2) has two images

Step 1

Concept

In a function every element of (A) must have exactly one image. In exams first check whether any input has two images.

Step 2

Why this answer is correct

The correct answer is B. यह फलन नहीं है क्योंकि (2) की दो छवियां हैं / It is not a function because (2) has two images. In a function every element of (A) must have exactly one image. In exams first check whether any input has two images.

Step 3

Exam Tip

फलन में (A) के हर अवयव की ठीक एक छवि होनी चाहिए। परीक्षा में पहले किसी इनपुट की दो छवियां जांचें।

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यदि \(A=\{0,1,2\}\) और \(B=\{3,4,5\}\) हों, तो (A) से (B) में कुल फलनों की संख्या कितनी होगी?

If \(A=\{0,1,2\}\) and \(B=\{3,4,5\}\), how many total functions are possible from (A) to (B)?

Explanation opens after your attempt
Correct Answer

C. (27)

Step 1

Concept

If (|A|=3) and (|B|=3), the number of functions is \(3^3=27\). Remember the formula \(|B|^{|A|}\) for exams.

Step 2

Why this answer is correct

The correct answer is C. (27). If (|A|=3) and (|B|=3), the number of functions is \(3^3=27\). Remember the formula \(|B|^{|A|}\) for exams.

Step 3

Exam Tip

यदि (|A|=3) और (|B|=3) हो, तो फलनों की संख्या \(3^3=27\) होती है। परीक्षा में सूत्र \(|B|^{|A|}\) याद रखें।

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संबंध \(R=\{(x,y):y^2=x,\ x\in{1,4,9},\ y\in{-3,-2,-1,1,2,3}\}\) को \(X=\{1,4,9\}\) से \(Y=\{-3,-2,-1,1,2,3\}\) में देखें। यह फलन क्यों नहीं है?

Consider the relation \(R=\{(x,y):y^2=x,\ x\in{1,4,9},\ y\in{-3,-2,-1,1,2,3}\}\) from \(X=\{1,4,9\}\) to \(Y=\{-3,-2,-1,1,2,3\}\). Why is it not a function?

Explanation opens after your attempt
Correct Answer

B. क्योंकि (4) की दो छवियां हैंBecause (4) has two images

Step 1

Concept

For (4), both (y=2) and (y=-2) occur. Two images for one input reject a function.

Step 2

Why this answer is correct

The correct answer is B. क्योंकि (4) की दो छवियां हैं / Because (4) has two images. For (4), both (y=2) and (y=-2) occur. Two images for one input reject a function.

Step 3

Exam Tip

(4) के लिए (y=2) और (y=-2) दोनों मिलते हैं। एक इनपुट की दो छवियां फलन को अस्वीकार कर देती हैं।

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फलन \(f:\mathbb{R}\to\mathbb{R}\) को (f(x)=\sqrt{x-2}) से परिभाषित करने का दावा किया गया है। कौन सा सुधार इसे सही फलन बनाता है?

A function \(f:\mathbb{R}\to\mathbb{R}\) is claimed to be defined by (f(x)=\sqrt{x-2}). Which correction makes it a valid function?

Explanation opens after your attempt
Correct Answer

A. डोमेन को \([2,\infty\)) कर देंChange the domain to \([2,\infty\))

Step 1

Concept

The value \(\sqrt{x-2}\) is real only when \(x\ge 2\). In such questions check domain validity before the formula.

Step 2

Why this answer is correct

The correct answer is A. डोमेन को \([2,\infty\)) कर दें / Change the domain to \([2,\infty\)). The value \(\sqrt{x-2}\) is real only when \(x\ge 2\). In such questions check domain validity before the formula.

Step 3

Exam Tip

\(\sqrt{x-2}\) वास्तविक तभी है जब \(x\ge 2\) हो। ऐसे प्रश्नों में सूत्र से पहले डोमेन की वैधता जांचें।

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यदि \(f:A\to B\) एक फलन है और \(A=\{p,q,r,s\}\), \(B=\{0,1\}\), तो (f(p)=0) और (f(q)=1) की शर्त के साथ कितने फलन संभव हैं?

If \(f:A\to B\) is a function and \(A=\{p,q,r,s\}\), \(B=\{0,1\}\), how many functions are possible with (f(p)=0) and (f(q)=1)?

Explanation opens after your attempt
Correct Answer

B. (4)

Step 1

Concept

The values of (p) and (q) are fixed, so (r,s) have \(2^2=4\) choices. Remove fixed inputs and apply the formula to the rest.

Step 2

Why this answer is correct

The correct answer is B. (4). The values of (p) and (q) are fixed, so (r,s) have \(2^2=4\) choices. Remove fixed inputs and apply the formula to the rest.

Step 3

Exam Tip

(p) और (q) तय हैं, इसलिए (r,s) के लिए \(2^2=4\) विकल्प हैं। तय इनपुट हटाकर बाकी पर सूत्र लगाएं।

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संबंध \(R=\{(x,y):x=y^2,\ x\in{0,1,4},\ y\in{0,1,2}\}\) को \(X=\{0,1,4\}\) से \(Y=\{0,1,2\}\) में माना गया है। सही निष्कर्ष क्या है?

The relation \(R=\{(x,y):x=y^2,\ x\in{0,1,4},\ y\in{0,1,2}\}\) is considered from \(X=\{0,1,4\}\) to \(Y=\{0,1,2\}\). What is the correct conclusion?

Explanation opens after your attempt
Correct Answer

A. यह फलन हैIt is a function

Step 1

Concept

For every \(x\in X\), exactly one (y) is obtained. Here the reverse square relation becomes a function on the given finite sets.

Step 2

Why this answer is correct

The correct answer is A. यह फलन है / It is a function. For every \(x\in X\), exactly one (y) is obtained. Here the reverse square relation becomes a function on the given finite sets.

Step 3

Exam Tip

हर \(x\in X\) के लिए ठीक एक (y) मिलता है। यहां उल्टा वर्ग संबंध भी दिए गए सीमित समुच्चयों में फलन बन रहा है।

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यदि \(A=\{1,2,3,4\}\) और \(f:A\to A\) को (f(x)=5-x) से दिया गया है, तो इस फलन का परिसर क्या है?

If \(A=\{1,2,3,4\}\) and \(f:A\to A\) is given by (f(x)=5-x), what is the range of this function?

Explanation opens after your attempt
Correct Answer

A. ({1,2,3,4})

Step 1

Concept

Here (f(1)=4), (f(2)=3), (f(3)=2), and (f(4)=1). The range is the set of actually obtained values.

Step 2

Why this answer is correct

The correct answer is A. ({1,2,3,4}). Here (f(1)=4), (f(2)=3), (f(3)=2), and (f(4)=1). The range is the set of actually obtained values.

Step 3

Exam Tip

(f(1)=4), (f(2)=3), (f(3)=2), (f(4)=1) है। परिसर केवल वास्तविक प्राप्त मानों का समुच्चय होता है।

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किस संबंध को \(A=\{1,2,3\}\) से \(B=\{4,5,6\}\) में फलन कहा जा सकता है?

Which relation can be called a function from \(A=\{1,2,3\}\) to \(B=\{4,5,6\}\)?

Explanation opens after your attempt
Correct Answer

C. ({(1,6),(2,6),(3,6)})

Step 1

Concept

In option (C), every element of (A) appears exactly once as the first component. Many inputs may have the same image in a function.

Step 2

Why this answer is correct

The correct answer is C. ({(1,6),(2,6),(3,6)}). In option (C), every element of (A) appears exactly once as the first component. Many inputs may have the same image in a function.

Step 3

Exam Tip

विकल्प (C) में (A) का हर अवयव ठीक एक बार प्रथम घटक के रूप में आता है। फलन में कई इनपुटों की एक ही छवि हो सकती है।

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फलन \(f:{1,2,3,4}\to\mathbb{N}\) को (f(x)=\frac{12}{x}) से परिभाषित किया गया है। कौन सा कथन सही है?

The function \(f:{1,2,3,4}\to\mathbb{N}\) is defined by (f(x)=\frac{12}{x}). Which statement is correct?

Explanation opens after your attempt
Correct Answer

B. यह फलन है और परिसर ({3,4,6,12}) हैIt is a function and range is ({3,4,6,12})

Step 1

Concept

For each given (x), \(\frac{12}{x}\) is a natural number. The obtained values are ({12,6,4,3}).

Step 2

Why this answer is correct

The correct answer is B. यह फलन है और परिसर ({3,4,6,12}) है / It is a function and range is ({3,4,6,12}). For each given (x), \(\frac{12}{x}\) is a natural number. The obtained values are ({12,6,4,3}).

Step 3

Exam Tip

प्रत्येक दिए गए (x) के लिए \(\frac{12}{x}\) प्राकृतिक संख्या है। प्राप्त मान ({12,6,4,3}) हैं।

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यदि \(f:\mathbb{R}\to\mathbb{R}\) को (f(x)=\frac{1}{x-2-9}) से दिया जाए, तो इसे सही वास्तविक फलन बनाने के लिए प्रांत क्या होना चाहिए?

If \(f:\mathbb{R}\to\mathbb{R}\) is given by (f(x)=\frac{1}{x-2-9}), what should be the domain to make it a valid real function?

Explanation opens after your attempt
Correct Answer

B. \(\mathbb{R}-{-3,3}\)

Step 1

Concept

The denominator needs \(x^2-9\ne0\), so \(x\ne -3,3\). In rational functions never allow the denominator to be zero.

Step 2

Why this answer is correct

The correct answer is B. \(\mathbb{R}-{-3,3}\). The denominator needs \(x^2-9\ne0\), so \(x\ne -3,3\). In rational functions never allow the denominator to be zero.

Step 3

Exam Tip

हर में \(x^2-9\ne0\) चाहिए, इसलिए \(x\ne -3,3\)। भिन्न वाले फलनों में हर को शून्य न होने दें।

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यदि \(A=\{1,2,3\}\), \(B=\{0,1\}\) और (R={(x,y):\(y\equiv x \pmod{2}\)}) हो, तो (R) के बारे में क्या सही है?

If \(A=\{1,2,3\}\), \(B=\{0,1\}\), and (R={(x,y):\(y\equiv x \pmod{2}\)}), what is correct about (R)?

Explanation opens after your attempt
Correct Answer

B. यह फलन है और परिसर ({0,1}) हैIt is a function and range is ({0,1})

Step 1

Concept

Odd numbers have image (1) and the even number has image (0). Having the same image is not a problem for a function.

Step 2

Why this answer is correct

The correct answer is B. यह फलन है और परिसर ({0,1}) है / It is a function and range is ({0,1}). Odd numbers have image (1) and the even number has image (0). Having the same image is not a problem for a function.

Step 3

Exam Tip

विषम संख्याओं की छवि (1) और सम संख्या की छवि (0) है। समान छवि होना फलन के लिए बाधा नहीं है।

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किस मान के लिए नियम \(f:\mathbb{R}\to\mathbb{R}\), (f(x)=\sqrt{ax+6}), पूरे \(\mathbb{R}\) पर फलन होगा?

For which value does the rule \(f:\mathbb{R}\to\mathbb{R}\), (f(x)=\sqrt{ax+6}), define a function on all of \(\mathbb{R}\)?

Explanation opens after your attempt
Correct Answer

A. (\ a=0)

Step 1

Concept

The expression (ax+6) stays non-negative for all real (x) only when (a=0). For a square-root function on all \(\mathbb{R}\), the linear part must be constant non-negative.

Step 2

Why this answer is correct

The correct answer is A. (\ a=0). The expression (ax+6) stays non-negative for all real (x) only when (a=0). For a square-root function on all \(\mathbb{R}\), the linear part must be constant non-negative.

Step 3

Exam Tip

(ax+6) सभी वास्तविक (x) के लिए अऋण तभी रहेगा जब (a=0) हो। पूरे \(\mathbb{R}\) पर मूल फलन में रैखिक भाग स्थिर अऋण होना चाहिए।

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यदि \(f:{1,2,3,4,5}\to{0,1}\) को (f(x)=1) जब (x) अभाज्य हो और (f(x)=0) अन्यथा दिया गया है, तो परिसर क्या है?

If \(f:{1,2,3,4,5}\to{0,1}\) is given by (f(x)=1) when (x) is prime and (f(x)=0) otherwise, what is the range?

Explanation opens after your attempt
Correct Answer

C. ({0,1})

Step 1

Concept

For (2,3,5), the value is (1), and for (1,4), the value is (0). The range is the part of the codomain that is actually obtained.

Step 2

Why this answer is correct

The correct answer is C. ({0,1}). For (2,3,5), the value is (1), and for (1,4), the value is (0). The range is the part of the codomain that is actually obtained.

Step 3

Exam Tip

(2,3,5) के लिए मान (1) और (1,4) के लिए मान (0) है। परिसर सहप्रांत का वह भाग है जो सच में प्राप्त होता है।

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संबंध \(R=\{(x,y):x+y=5\}\) को \(A=\{1,2,3,4\}\) से \(B=\{1,2,3,4\}\) में माना गया है। (R) क्या है?

The relation \(R=\{(x,y):x+y=5\}\) is considered from \(A=\{1,2,3,4\}\) to \(B=\{1,2,3,4\}\). What is (R)?

Explanation opens after your attempt
Correct Answer

A. फलन है और परिसर ({1,2,3,4}) हैIt is a function and range is ({1,2,3,4})

Step 1

Concept

For every (x), (y=5-x) is unique and lies in (B). In finite sets check each input image separately.

Step 2

Why this answer is correct

The correct answer is A. फलन है और परिसर ({1,2,3,4}) है / It is a function and range is ({1,2,3,4}). For every (x), (y=5-x) is unique and lies in (B). In finite sets check each input image separately.

Step 3

Exam Tip

हर (x) के लिए (y=5-x) अद्वितीय और (B) में है। सीमित समुच्चय में हर इनपुट की छवि अलग से जांचें।

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यदि \(f:A\to B\) फलन है, तो उसके ग्राफ को संबंध के रूप में पहचानने की आवश्यक शर्त कौन सी है?

If \(f:A\to B\) is a function, which is a necessary condition for its graph as a relation?

Explanation opens after your attempt
Correct Answer

A. प्रत्येक \(a\in A\) के लिए ठीक एक \(b\in B\) ऐसा है कि \((a,b)\in f\)For each \(a\in A\), exactly one \(b\in B\) has \((a,b)\in f\)

Step 1

Concept

A function is a special relation where each element of the first set maps exactly once. Every codomain element need not occur.

Step 2

Why this answer is correct

The correct answer is A. प्रत्येक \(a\in A\) के लिए ठीक एक \(b\in B\) ऐसा है कि \((a,b)\in f\) / For each \(a\in A\), exactly one \(b\in B\) has \((a,b)\in f\). A function is a special relation where each element of the first set maps exactly once. Every codomain element need not occur.

Step 3

Exam Tip

फलन संबंध का विशेष रूप है जिसमें प्रथम समुच्चय का हर अवयव ठीक एक बार मैप होता है। सहप्रांत का हर अवयव आना आवश्यक नहीं है।

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यदि \(A=\{1,2,3\}\), \(B=\{1,2,3,4\}\) और (f(x)=x+1), तो (f) किस प्रकार सही है?

If \(A=\{1,2,3\}\), \(B=\{1,2,3,4\}\), and (f(x)=x+1), which statement about (f) is correct?

Explanation opens after your attempt
Correct Answer

A. यह (A) से (B) में फलन है और परिसर ({2,3,4}) हैIt is a function from (A) to (B) and range is ({2,3,4})

Step 1

Concept

The images of (1,2,3) are (2,3,4), all lying in (B). Remember the difference between codomain and range.

Step 2

Why this answer is correct

The correct answer is A. यह (A) से (B) में फलन है और परिसर ({2,3,4}) है / It is a function from (A) to (B) and range is ({2,3,4}). The images of (1,2,3) are (2,3,4), all lying in (B). Remember the difference between codomain and range.

Step 3

Exam Tip

(1,2,3) की छवियां क्रमशः (2,3,4) हैं और सभी (B) में हैं। सहप्रांत और परिसर में अंतर याद रखें।

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किस न्यूनतम परिवर्तन से \(R=\{(1,2),(2,3),(2,4),(3,5)\}\) को \(A=\{1,2,3\}\) से \(B=\{2,3,4,5\}\) में फलन बनाया जा सकता है?

What is the minimum change to make \(R=\{(1,2),(2,3),(2,4),(3,5)\}\) a function from \(A=\{1,2,3\}\) to \(B=\{2,3,4,5\}\)?

Explanation opens after your attempt
Correct Answer

A. ((2,3)) या ((2,4)) में से एक हटाएंRemove one of ((2,3)) or ((2,4))

Step 1

Concept

Only (2) has two images, so removing one of them is enough. To make a function, give each first component exactly one image.

Step 2

Why this answer is correct

The correct answer is A. ((2,3)) या ((2,4)) में से एक हटाएं / Remove one of ((2,3)) or ((2,4)). Only (2) has two images, so removing one of them is enough. To make a function, give each first component exactly one image.

Step 3

Exam Tip

केवल (2) की दो छवियां हैं, इसलिए उनमें से एक हटाना पर्याप्त है। फलन बनाने के लिए हर प्रथम घटक को ठीक एक छवि दें।

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यदि \(f:\mathbb{R}\to\mathbb{R}\) को (f(x)=|x-2|+3) से दिया गया है, तो परिसर क्या है?

If \(f:\mathbb{R}\to\mathbb{R}\) is given by (f(x)=|x-2|+3), what is the range?

Explanation opens after your attempt
Correct Answer

A. \([3,\infty\))

Step 1

Concept

Since \(|x-2|\ge0\), the minimum value is (3). For modulus functions find the minimum value to get the range.

Step 2

Why this answer is correct

The correct answer is A. \([3,\infty\)). Since \(|x-2|\ge0\), the minimum value is (3). For modulus functions find the minimum value to get the range.

Step 3

Exam Tip

\(|x-2|\ge0\), इसलिए न्यूनतम मान (3) है। मापांक वाले फलनों में न्यूनतम मान से परिसर निकालें।

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किस विकल्प में दिया गया नियम \(\mathbb{R}\) से \(\mathbb{R}\) में फलन नहीं है?

Which option gives a rule that is not a function from \(\mathbb{R}\) to \(\mathbb{R}\)?

Explanation opens after your attempt
Correct Answer

B. (f(x)=\frac{1}{x})

Step 1

Concept

For (f(x)=\frac{1}{x}), the value is undefined at (x=0). A function from \(\mathbb{R}\) must have a value for every real (x).

Step 2

Why this answer is correct

The correct answer is B. (f(x)=\frac{1}{x}). For (f(x)=\frac{1}{x}), the value is undefined at (x=0). A function from \(\mathbb{R}\) must have a value for every real (x).

Step 3

Exam Tip

(f(x)=\frac{1}{x}) में (x=0) पर मान परिभाषित नहीं है। \(\mathbb{R}\) से फलन के लिए हर वास्तविक (x) पर मान चाहिए।

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यदि \(A=\{1,2,3,4\}\) और \(B=\{a,b,c\}\) हों, तो ऐसे कितने फलन \(f:A\to B\) हैं जिनमें (f(1)=f(2)) हो?

If \(A=\{1,2,3,4\}\) and \(B=\{a,b,c\}\), how many functions \(f:A\to B\) satisfy (f(1)=f(2))?

Explanation opens after your attempt
Correct Answer

B. (27)

Step 1

Concept

There are (3) choices for the common value of (f(1)=f(2)) and \(3^2\) choices for (3,4). Total functions are \(3\cdot3^2=27\).

Step 2

Why this answer is correct

The correct answer is B. (27). There are (3) choices for the common value of (f(1)=f(2)) and \(3^2\) choices for (3,4). Total functions are \(3\cdot3^2=27\).

Step 3

Exam Tip

(f(1)=f(2)) के लिए (3) विकल्प हैं और (3,4) के लिए \(3^2\) विकल्प हैं। कुल \(3\cdot3^2=27\) फलन हैं।

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संबंध \(R=\{(x,y):y=|x|,\ x\in{-2,-1,0,1,2},\ y\in{0,1,2}\}\) के बारे में सही कथन क्या है?

What is correct about the relation \(R=\{(x,y):y=|x|,\ x\in{-2,-1,0,1,2},\ y\in{0,1,2}\}\)?

Explanation opens after your attempt
Correct Answer

A. यह फलन है और परिसर ({0,1,2}) हैIt is a function and range is ({0,1,2})

Step 1

Concept

Each input has only one absolute value, even if two inputs share an image. The obtained values are (0,1,2).

Step 2

Why this answer is correct

The correct answer is A. यह फलन है और परिसर ({0,1,2}) है / It is a function and range is ({0,1,2}). Each input has only one absolute value, even if two inputs share an image. The obtained values are (0,1,2).

Step 3

Exam Tip

हर इनपुट का केवल एक मापांक मान है, भले दो इनपुटों की छवि समान हो। प्राप्त मान (0,1,2) हैं।

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फलन \(f:\mathbb{Z}\to\mathbb{Z}\) को (f(x)=\frac{x+1}{2}) से परिभाषित करने का दावा है। यह दावा क्यों गलत है?

A function \(f:\mathbb{Z}\to\mathbb{Z}\) is claimed to be defined by (f(x)=\frac{x+1}{2}). Why is this claim false?

Explanation opens after your attempt
Correct Answer

B. क्योंकि (x=0) पर मान \(\frac{1}{2}\notin\mathbb{Z}\) हैBecause at (x=0), the value is \(\frac{1}{2}\notin\mathbb{Z}\)

Step 1

Concept

Putting (x=0) gives \(\frac{1}{2}\), which is not in the codomain \(\mathbb{Z}\). Every value of a function must lie in the codomain.

Step 2

Why this answer is correct

The correct answer is B. क्योंकि (x=0) पर मान \(\frac{1}{2}\notin\mathbb{Z}\) है / Because at (x=0), the value is \(\frac{1}{2}\notin\mathbb{Z}\). Putting (x=0) gives \(\frac{1}{2}\), which is not in the codomain \(\mathbb{Z}\). Every value of a function must lie in the codomain.

Step 3

Exam Tip

(x=0) देने पर मान \(\frac{1}{2}\) आता है, जो सहप्रांत \(\mathbb{Z}\) में नहीं है। फलन में हर मान सहप्रांत में होना चाहिए।

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यदि \(A=\{1,2,3\}\) और \(B=\{1,4,9,16\}\), तो \(R=\{(x,y):y=x^2\}\) के लिए सही कथन कौन सा है?

If \(A=\{1,2,3\}\) and \(B=\{1,4,9,16\}\), which statement is correct for \(R=\{(x,y):y=x^2\}\)?

Explanation opens after your attempt
Correct Answer

B. यह फलन है और परिसर ({1,4,9}) हैIt is a function and range is ({1,4,9})

Step 1

Concept

Every \(x\in A\) has one image \(x^2\in B\). The element (16) is in the codomain but not in the range.

Step 2

Why this answer is correct

The correct answer is B. यह फलन है और परिसर ({1,4,9}) है / It is a function and range is ({1,4,9}). Every \(x\in A\) has one image \(x^2\in B\). The element (16) is in the codomain but not in the range.

Step 3

Exam Tip

हर \(x\in A\) की एक छवि \(x^2\in B\) है। (16) सहप्रांत में है पर परिसर में नहीं आता।

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यदि \(f:{1,2,3,4}\to{1,2,3,4}\) को (f(x)=x-2-3x+4) से दिया गया है, तो क्या (f) वैध फलन है?

If \(f:{1,2,3,4}\to{1,2,3,4}\) is given by (f(x)=x-2-3x+4), is (f) a valid function?

Explanation opens after your attempt
Correct Answer

B. नहीं, क्योंकि \(f(4)=8\notin{1,2,3,4}\)No, because \(f(4)=8\notin{1,2,3,4}\)

Step 1

Concept

Here (f(4)=16-12+4=8), which is not in the codomain. For finite domains, checking all values is the safe method.

Step 2

Why this answer is correct

The correct answer is B. नहीं, क्योंकि \(f(4)=8\notin{1,2,3,4}\) / No, because \(f(4)=8\notin{1,2,3,4}\). Here (f(4)=16-12+4=8), which is not in the codomain. For finite domains, checking all values is the safe method.

Step 3

Exam Tip

(f(4)=16-12+4=8) है, जो सहप्रांत में नहीं है। सीमित प्रांत में सभी मानों की जांच करना सुरक्षित तरीका है।

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नीचे दिए गए में से कौन सा संबंध \(A=\{0,1,2\}\) से \(B=\{0,1,2,3\}\) में फलन है लेकिन (A) के दो अवयवों की छवि समान है?

Which relation below is a function from \(A=\{0,1,2\}\) to \(B=\{0,1,2,3\}\) but has the same image for two elements of (A)?

Explanation opens after your attempt
Correct Answer

B. ({(0,1),(1,1),(2,3)})

Step 1

Concept

In option (B), both (0) and (1) have image (1), and every input has exactly one image. A common image does not prevent a function.

Step 2

Why this answer is correct

The correct answer is B. ({(0,1),(1,1),(2,3)}). In option (B), both (0) and (1) have image (1), and every input has exactly one image. A common image does not prevent a function.

Step 3

Exam Tip

विकल्प (B) में (0) और (1) दोनों की छवि (1) है और हर इनपुट की एक ही छवि है। समान छवि फलन को नहीं रोकती।

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यदि \(f:\mathbb{R}\to\mathbb{R}\) और (f(x)=\frac{x-2-4}{x-2}) हो, तो दावा कि यह पूरे \(\mathbb{R}\) पर फलन है, क्यों गलत है?

If \(f:\mathbb{R}\to\mathbb{R}\) and (f(x)=\frac{x-2-4}{x-2}), why is the claim that it is a function on all of \(\mathbb{R}\) false?

Explanation opens after your attempt
Correct Answer

A. क्योंकि (x=2) पर सूत्र अपरिभाषित हैBecause the formula is undefined at (x=2)

Step 1

Concept

Even though simplification looks like (x+2), the original formula is undefined at (x=2). When deciding domain, check the original denominator.

Step 2

Why this answer is correct

The correct answer is A. क्योंकि (x=2) पर सूत्र अपरिभाषित है / Because the formula is undefined at (x=2). Even though simplification looks like (x+2), the original formula is undefined at (x=2). When deciding domain, check the original denominator.

Step 3

Exam Tip

भले सरलीकरण (x+2) जैसा दिखे, मूल सूत्र (x=2) पर परिभाषित नहीं है। प्रांत तय करते समय मूल हर को देखें।

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संबंध \(R=\{(x,y):y^3=x,\ x\in{-8,-1,0,1,8},\ y\in{-2,-1,0,1,2}\}\) के बारे में क्या सही है?

What is correct about \(R=\{(x,y):y^3=x,\ x\in{-8,-1,0,1,8},\ y\in{-2,-1,0,1,2}\}\)?

Explanation opens after your attempt
Correct Answer

A. यह फलन हैIt is a function

Step 1

Concept

Each (x) has a unique real cube root lying in the given (Y). A cube-root relation does not give two values like a square-root relation.

Step 2

Why this answer is correct

The correct answer is A. यह फलन है / It is a function. Each (x) has a unique real cube root lying in the given (Y). A cube-root relation does not give two values like a square-root relation.

Step 3

Exam Tip

हर (x) का वास्तविक घनमूल अद्वितीय है और दिए गए (Y) में है। घनमूल संबंध वर्गमूल वाले संबंध जैसा दो मान नहीं देता।

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यदि \(A=\{1,2,3,4\}\) और \(B=\{1,2\}\), तो (A) से (B) में ऐसे कितने फलन हैं जिनका परिसर ठीक ({1}) हो?

If \(A=\{1,2,3,4\}\) and \(B=\{1,2\}\), how many functions from (A) to (B) have range exactly ({1})?

Explanation opens after your attempt
Correct Answer

B. (1)

Step 1

Concept

For the range to be exactly ({1}), every input must have image (1). So only one constant function is possible.

Step 2

Why this answer is correct

The correct answer is B. (1). For the range to be exactly ({1}), every input must have image (1). So only one constant function is possible.

Step 3

Exam Tip

परिसर ठीक ({1}) होने के लिए हर इनपुट की छवि (1) ही होनी चाहिए। इसलिए केवल एक स्थिर फलन संभव है।

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किस संबंध में प्रथम घटकों का समुच्चय \(A=\{1,2,3,4\}\) पूरा है लेकिन फिर भी वह (A) से \(B=\{a,b,c\}\) में फलन नहीं है?

Which relation has the complete set of first components \(A=\{1,2,3,4\}\) but still is not a function from (A) to \(B=\{a,b,c\}\)?

Explanation opens after your attempt
Correct Answer

C. ({(1,a),(2,b),(3,c),(4,a),(4,b)})

Step 1

Concept

In option (C), (4) has two images (a) and (b). Having all first components is not enough; uniqueness is also required.

Step 2

Why this answer is correct

The correct answer is C. ({(1,a),(2,b),(3,c),(4,a),(4,b)}). In option (C), (4) has two images (a) and (b). Having all first components is not enough; uniqueness is also required.

Step 3

Exam Tip

विकल्प (C) में (4) की दो छवियां (a) और (b) हैं। केवल सभी प्रथम घटकों का होना काफी नहीं, अद्वितीयता भी चाहिए।

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यदि \(f:\mathbb{R}\to\mathbb{R}\), (f(x)=x-2), तो संबंध के रूप में \(f^{-1}\) क्यों \(\mathbb{R}\) से \(\mathbb{R}\) में फलन नहीं है?

If \(f:\mathbb{R}\to\mathbb{R}\), (f(x)=x-2), why is \(f^{-1}\) as a relation not a function from \(\mathbb{R}\) to \(\mathbb{R}\)?

Explanation opens after your attempt
Correct Answer

A. क्योंकि (1) की पूर्वछवियां (1) और (-1) दोनों हैंBecause (1) has preimages (1) and (-1)

Step 1

Concept

In the inverse relation, (1) is related to both (1) and (-1). Two images for one input make the inverse relation not a function.

Step 2

Why this answer is correct

The correct answer is A. क्योंकि (1) की पूर्वछवियां (1) और (-1) दोनों हैं / Because (1) has preimages (1) and (-1). In the inverse relation, (1) is related to both (1) and (-1). Two images for one input make the inverse relation not a function.

Step 3

Exam Tip

उल्टे संबंध में (1) से (1) और (-1) दोनों जुड़ते हैं। एक इनपुट की दो छवियां होने से उल्टा संबंध फलन नहीं रहता।

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यदि \(f:{1,2,3,4,5}\to{0,1}\) को (f(x)=0) जब (x) सम हो और (f(x)=1) जब (x) विषम हो, तो (f^{-1}({0})) क्या है?

If \(f:{1,2,3,4,5}\to{0,1}\) is given by (f(x)=0) when (x) is even and (f(x)=1) when (x) is odd, what is (f^{-1}({0}))?

Explanation opens after your attempt
Correct Answer

B. ({2,4})

Step 1

Concept

The value (0) is produced by even inputs, namely (2) and (4). A preimage contains elements of the domain, not of the codomain.

Step 2

Why this answer is correct

The correct answer is B. ({2,4}). The value (0) is produced by even inputs, namely (2) and (4). A preimage contains elements of the domain, not of the codomain.

Step 3

Exam Tip

(0) वे इनपुट देते हैं जो सम हैं, यानी (2) और (4)। पूर्वछवि में डोमेन के अवयव आते हैं, सहप्रांत के नहीं।

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यदि \(f:A\to B\) में \(A=\{1,2,3\}\) और \(B=\{1,2,3\}\) हों, तो (f(x)=x-2) को (A) से (B) में फलन क्यों नहीं कहा जा सकता?

If \(A=\{1,2,3\}\) and \(B=\{1,2,3\}\), why cannot (f(x)=x-2) be called a function from (A) to (B)?

Explanation opens after your attempt
Correct Answer

A. क्योंकि \(f(2)=4\notin B\)Because \(f(2)=4\notin B\)

Step 1

Concept

The image of (2) is (4), which is not in the codomain (B). For a function, every image must lie in the codomain.

Step 2

Why this answer is correct

The correct answer is A. क्योंकि \(f(2)=4\notin B\) / Because \(f(2)=4\notin B\). The image of (2) is (4), which is not in the codomain (B). For a function, every image must lie in the codomain.

Step 3

Exam Tip

(2) की छवि (4) है जो सहप्रांत (B) में नहीं है। फलन के लिए हर छवि सहप्रांत में होनी चाहिए।

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संबंध \(R=\{(x,y):y=\frac{x}{|x|},\ x\in{-3,-2,-1,1,2,3}\}\) के लिए परिसर क्या है?

What is the range of the relation \(R=\{(x,y):y=\frac{x}{|x|},\ x\in{-3,-2,-1,1,2,3}\}\)?

Explanation opens after your attempt
Correct Answer

A. ({-1,1})

Step 1

Concept

For negative (x), the value is (-1), and for positive (x), it is (1). Since (x=0) is not in the domain, there is no issue.

Step 2

Why this answer is correct

The correct answer is A. ({-1,1}). For negative (x), the value is (-1), and for positive (x), it is (1). Since (x=0) is not in the domain, there is no issue.

Step 3

Exam Tip

ऋणात्मक (x) के लिए मान (-1) और धनात्मक (x) के लिए (1) है। (x=0) प्रांत में नहीं है, इसलिए समस्या नहीं है।

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यदि \(f:\mathbb{R}\to\mathbb{R}\) को (f(x)=\sqrt{4-x-2}) से देना हो, तो सही प्रांत कौन सा है?

If \(f:\mathbb{R}\to\mathbb{R}\) is to be given by (f(x)=\sqrt{4-x-2}), which is the correct domain?

Explanation opens after your attempt
Correct Answer

A. ([-2,2])

Step 1

Concept

For real values, \(4-x^2\ge0\), so \(-2\le x\le2\). In square-root questions keep the radicand non-negative.

Step 2

Why this answer is correct

The correct answer is A. ([-2,2]). For real values, \(4-x^2\ge0\), so \(-2\le x\le2\). In square-root questions keep the radicand non-negative.

Step 3

Exam Tip

वास्तविक मान के लिए \(4-x^2\ge0\), इसलिए \(-2\le x\le2\)। मूल वाले प्रश्नों में भीतर की राशि अऋण रखें।

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यदि \(A=\{a,b,c\}\) और \(B=\{1,2,3,4\}\), तो (A) से (B) में कुल कितने फलन हैं जिनमें (f(a)=2) हो?

If \(A=\{a,b,c\}\) and \(B=\{1,2,3,4\}\), how many functions from (A) to (B) satisfy (f(a)=2)?

Explanation opens after your attempt
Correct Answer

C. (16)

Step 1

Concept

The image of (a) is fixed, so (b,c) have \(4^2=16\) choices. In restricted functions count the free inputs.

Step 2

Why this answer is correct

The correct answer is C. (16). The image of (a) is fixed, so (b,c) have \(4^2=16\) choices. In restricted functions count the free inputs.

Step 3

Exam Tip

(a) की छवि तय है, इसलिए (b,c) के लिए \(4^2=16\) विकल्प हैं। प्रतिबंधित फलनों में मुक्त इनपुट गिनें।

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किस विकल्प में \(g:\mathbb{N}\to\mathbb{N}\) वैध फलन है?

Which option gives a valid function \(g:\mathbb{N}\to\mathbb{N}\)?

Explanation opens after your attempt
Correct Answer

B. (g(n)=2n+1)

Step 1

Concept

For every natural (n), (2n+1) is a natural number. The other options do not give values in \(\mathbb{N}\) for all (n).

Step 2

Why this answer is correct

The correct answer is B. (g(n)=2n+1). For every natural (n), (2n+1) is a natural number. The other options do not give values in \(\mathbb{N}\) for all (n).

Step 3

Exam Tip

प्रत्येक प्राकृतिक (n) के लिए (2n+1) प्राकृतिक संख्या है। अन्य विकल्प सभी (n) के लिए \(\mathbb{N}\) में मान नहीं देते।

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यदि \(R=\{(x,y):y=x^2,\ x\in[-2,2],\ y\in[0,4]\}\), तो (R) के बारे में सही कथन क्या है?

If \(R=\{(x,y):y=x^2,\ x\in[-2,2],\ y\in[0,4]\}\), what is correct about (R)?

Explanation opens after your attempt
Correct Answer

A. यह फलन है और परिसर ([0,4]) हैIt is a function and range is ([0,4])

Step 1

Concept

Each (x) has a unique image \(x^2\) lying in ([0,4]). Equal outputs do not prevent a relation from being a function.

Step 2

Why this answer is correct

The correct answer is A. यह फलन है और परिसर ([0,4]) है / It is a function and range is ([0,4]). Each (x) has a unique image \(x^2\) lying in ([0,4]). Equal outputs do not prevent a relation from being a function.

Step 3

Exam Tip

हर (x) की छवि \(x^2\) अद्वितीय है और ([0,4]) में है। समान आउटपुट फलन होने में बाधा नहीं है।

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यदि \(f:\mathbb{R}\to\mathbb{R}\) को (f(x)=\begin{cases}x+1,&x<0\x-2,&x\ge0\end{cases}) से दिया गया है, तो (f(0)) क्या होगा?

If \(f:\mathbb{R}\to\mathbb{R}\) is given by (f(x)=\begin{cases}x+1,&x<0\x-2,&x\ge0\end{cases}), what is (f(0))?

Explanation opens after your attempt
Correct Answer

B. (0)

Step 1

Concept

Since \(0\ge0\), the second rule applies and (f(0)=02=0). In piecewise functions read the boundary symbol carefully.

Step 2

Why this answer is correct

The correct answer is B. (0). Since \(0\ge0\), the second rule applies and (f(0)=02=0). In piecewise functions read the boundary symbol carefully.

Step 3

Exam Tip

\(0\ge0\) है, इसलिए दूसरा नियम लागू होगा और (f(0)=02=0)। खंडित फलन में सीमा चिह्न ध्यान से पढ़ें।

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निम्न में से किस खंडित नियम से \(\mathbb{R}\) पर फलन नहीं बनेगा?

Which piecewise rule will not define a function on \(\mathbb{R}\)?

Explanation opens after your attempt
Correct Answer

C. (f(x)=\begin{cases}x-2,&x\le2\x+3,&x\ge2\end{cases})

Step 1

Concept

In option (C), (x=2) belongs to both rules and gives values (4) and (5). Two values for one input do not define a function.

Step 2

Why this answer is correct

The correct answer is C. (f(x)=\begin{cases}x-2,&x\le2\x+3,&x\ge2\end{cases}). In option (C), (x=2) belongs to both rules and gives values (4) and (5). Two values for one input do not define a function.

Step 3

Exam Tip

विकल्प (C) में (x=2) दोनों नियमों में आता है और मान (4) तथा (5) मिलते हैं। एक ही इनपुट पर दो मान फलन नहीं बनाते।

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यदि \(A=\{1,2,3\}\) और \(B=\{1,2\}\), तो \(A\times B\) के कितने उपसमुच्चय (A) से (B) में फलन हैं?

If \(A=\{1,2,3\}\) and \(B=\{1,2\}\), how many subsets of \(A\times B\) are functions from (A) to (B)?

Explanation opens after your attempt
Correct Answer

B. (8)

Step 1

Concept

A function is a subset of \(A\times B\) where one pair is chosen for each element of (A) from (2) choices. Total is \(2^3=8\).

Step 2

Why this answer is correct

The correct answer is B. (8). A function is a subset of \(A\times B\) where one pair is chosen for each element of (A) from (2) choices. Total is \(2^3=8\).

Step 3

Exam Tip

फलन \(A\times B\) का ऐसा उपसमुच्चय है जिसमें (A) के हर अवयव के लिए (2) में से एक जोड़ी चुनी जाती है। कुल \(2^3=8\) हैं।

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यदि \(f:{1,2,3,4}\to{1,2,3,4}\) को (f(x)=x) जब (x) सम हो और (f(x)=5-x) जब (x) विषम हो, तो परिसर क्या है?

If \(f:{1,2,3,4}\to{1,2,3,4}\) is given by (f(x)=x) when (x) is even and (f(x)=5-x) when (x) is odd, what is the range?

Explanation opens after your attempt
Correct Answer

B. ({2,4})

Step 1

Concept

Here (f(1)=4), (f(2)=2), (f(3)=2), and (f(4)=4), so the range is ({2,4}). For a piecewise rule list every input value.

Step 2

Why this answer is correct

The correct answer is B. ({2,4}). Here (f(1)=4), (f(2)=2), (f(3)=2), and (f(4)=4), so the range is ({2,4}). For a piecewise rule list every input value.

Step 3

Exam Tip

(f(1)=4), (f(2)=2), (f(3)=2), (f(4)=4), इसलिए परिसर ({2,4}) है। खंडित नियम में हर इनपुट का मान लिखें।

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यदि \(f:A\to B\) में (|A|=5) और (|B|=2), तो कुल संबंधों की संख्या \(2^{10}\) है। इनमें फलनों की संख्या कितनी है?

If \(f:A\to B\) has (|A|=5) and (|B|=2), the number of all relations is \(2^{10}\). How many of these are functions?

Explanation opens after your attempt
Correct Answer

C. (32)

Step 1

Concept

The number of functions is \(|B|^{|A|}=2^5=32\). Keep the formulas for all relations and all functions separate.

Step 2

Why this answer is correct

The correct answer is C. (32). The number of functions is \(|B|^{|A|}=2^5=32\). Keep the formulas for all relations and all functions separate.

Step 3

Exam Tip

फलनों की संख्या \(|B|^{|A|}=2^5=32\) होती है। कुल संबंधों और कुल फलनों के सूत्र अलग रखें।

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यदि \(R=\{(x,y):x=|y|,\ x\in{0,1,2},\ y\in{-2,-1,0,1,2}\}\) को \(X=\{0,1,2\}\) से \(Y=\{-2,-1,0,1,2\}\) में माना जाए, तो (R) क्या है?

If \(R=\{(x,y):x=|y|,\ x\in{0,1,2},\ y\in{-2,-1,0,1,2}\}\) is considered from \(X=\{0,1,2\}\) to \(Y=\{-2,-1,0,1,2\}\), what is (R)?

Explanation opens after your attempt
Correct Answer

B. फलन नहीं है क्योंकि (1) की छवियां (-1) और (1) हैंIt is not a function because (1) has images (-1) and (1)

Step 1

Concept

For (x=1), both (y=-1) and (y=1) are possible. Two (y)-values for one (x) mean the relation is not a function.

Step 2

Why this answer is correct

The correct answer is B. फलन नहीं है क्योंकि (1) की छवियां (-1) और (1) हैं / It is not a function because (1) has images (-1) and (1). For (x=1), both (y=-1) and (y=1) are possible. Two (y)-values for one (x) mean the relation is not a function.

Step 3

Exam Tip

(x=1) के लिए (y=-1) और (y=1) दोनों संभव हैं। एक (x) के दो (y) होने से संबंध फलन नहीं है।

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यदि \(f:\mathbb{R}\to[0,\infty\)) को (f(x)=x-2+2x+2) से दिया गया है, तो परिसर क्या है?

If \(f:\mathbb{R}\to[0,\infty\)) is given by (f(x)=x-2+2x+2), what is the range?

Explanation opens after your attempt
Correct Answer

B. \([1,\infty\))

Step 1

Concept

Since (x-2+2x+2=(x+1)2+1), the minimum value is (1). Completing the square is useful for finding range.

Step 2

Why this answer is correct

The correct answer is B. \([1,\infty\)). Since (x-2+2x+2=(x+1)2+1), the minimum value is (1). Completing the square is useful for finding range.

Step 3

Exam Tip

(x-2+2x+2=(x+1)2+1), इसलिए न्यूनतम मान (1) है। वर्ग पूरा करना परिसर निकालने का उपयोगी तरीका है।

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यदि \(f:{0,1,2,3}\to{0,1,2,3}\) को (f(x)) बराबर (x) को (3) से भाग देने पर शेषफल से दिया गया है, तो कौन सा कथन सही है?

If \(f:{0,1,2,3}\to{0,1,2,3}\) is given by (f(x)) as the remainder when (x) is divided by (3), which statement is correct?

Explanation opens after your attempt
Correct Answer

A. परिसर ({0,1,2}) हैThe range is ({0,1,2})

Step 1

Concept

The remainders of (0,1,2,3) are (0,1,2,0). The remainder is unique, so this is a function.

Step 2

Why this answer is correct

The correct answer is A. परिसर ({0,1,2}) है / The range is ({0,1,2}). The remainders of (0,1,2,3) are (0,1,2,0). The remainder is unique, so this is a function.

Step 3

Exam Tip

(0,1,2,3) के शेषफल क्रमशः (0,1,2,0) हैं। शेषफल अद्वितीय होता है, इसलिए यह फलन है।

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यदि \(f:\mathbb{R}\to\mathbb{R}\) में (f(x)=\frac{x-a}{x-2-4}) हो, तो कौन सा कथन सही है?

If \(f:\mathbb{R}\to\mathbb{R}\) has (f(x)=\frac{x-a}{x-2-4}), which statement is correct?

Explanation opens after your attempt
Correct Answer

A. यह पूरे \(\mathbb{R}\) पर कभी फलन नहीं होगाIt will never be a function on all of \(\mathbb{R}\)

Step 1

Concept

The denominator \(x^2-4\) is zero at \(x=\pm2\), so the original formula is undefined there. A zero denominator cannot be fully removed for all real inputs.

Step 2

Why this answer is correct

The correct answer is A. यह पूरे \(\mathbb{R}\) पर कभी फलन नहीं होगा / It will never be a function on all of \(\mathbb{R}\). The denominator \(x^2-4\) is zero at \(x=\pm2\), so the original formula is undefined there. A zero denominator cannot be fully removed for all real inputs.

Step 3

Exam Tip

हर \(x^2-4\) शून्य होता है जब \(x=\pm2\), इसलिए मूल सूत्र वहां अपरिभाषित है। हर की शून्यता को घटाने से पूरी तरह नहीं हटाया जा सकता।

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किस विकल्प में दिया गया संबंध \(A=\{1,2,3,4\}\) से \(B=\{0,1\}\) में फलन है?

Which option gives a function from \(A=\{1,2,3,4\}\) to \(B=\{0,1\}\)?

Explanation opens after your attempt
Correct Answer

B. \((R={(x,y):y=0\) यदि \(x<3,\ y=1\) यदि \(x\ge3})\)\((R={(x,y):y=0\) if \(x<3,\ y=1\) if \(x\ge3})\)

Step 1

Concept

Option (B) assigns exactly one value to every (x). The other options miss some inputs or give multiple values.

Step 2

Why this answer is correct

\(The correct answer is B. (R={(x,y):y=0\) यदि \(x<3,\ y=1\) यदि \(x\ge3}) / (R={(x,y):y=0\) if \(x<3,\ y=1\) if \(x\ge3}). Option (B) assigns exactly one value to every (x). The other options miss some inputs or give multiple values.\)

Step 3

Exam Tip

विकल्प (B) हर (x) को ठीक एक मान देता है। बाकी विकल्पों में कुछ इनपुट छूटते हैं या कई मान मिलते हैं।

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यदि \(f:{1,2,3}\to{1,2,3,4,5}\) और (f(x)=2x-1), तो कौन सा कथन सही है?

If \(f:{1,2,3}\to{1,2,3,4,5}\) and (f(x)=2x-1), which statement is correct?

Explanation opens after your attempt
Correct Answer

A. यह फलन है और परिसर ({1,3,5}) हैIt is a function and range is ({1,3,5})

Step 1

Concept

The values obtained are (1,3,5), and all lie in the codomain. Not every element of the codomain needs to occur.

Step 2

Why this answer is correct

The correct answer is A. यह फलन है और परिसर ({1,3,5}) है / It is a function and range is ({1,3,5}). The values obtained are (1,3,5), and all lie in the codomain. Not every element of the codomain needs to occur.

Step 3

Exam Tip

मान (1,3,5) मिलते हैं और सभी सहप्रांत में हैं। सहप्रांत के सभी अवयवों का आना आवश्यक नहीं होता।

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यदि \(f:A\to B\) एक फलन है और (A) रिक्त समुच्चय नहीं है, तो (f) के रिक्त संबंध होने पर सही निष्कर्ष क्या है?

If \(f:A\to B\) is a function and (A) is not an empty set, what is the correct conclusion if (f) is the empty relation?

Explanation opens after your attempt
Correct Answer

B. यह फलन नहीं है क्योंकि (A) के अवयवों की छवि नहीं हैIt is not a function because elements of (A) have no images

Step 1

Concept

When \(A\ne\emptyset\), the empty relation gives no image to any element of (A). A function requires an image for every input.

Step 2

Why this answer is correct

The correct answer is B. यह फलन नहीं है क्योंकि (A) के अवयवों की छवि नहीं है / It is not a function because elements of (A) have no images. When \(A\ne\emptyset\), the empty relation gives no image to any element of (A). A function requires an image for every input.

Step 3

Exam Tip

जब \(A\ne\emptyset\) हो, तो खाली संबंध (A) के किसी अवयव को छवि नहीं देता। फलन के लिए हर इनपुट की छवि आवश्यक है।

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यदि \(A=\emptyset\) और \(B=\{1,2,3\}\), तो (A) से (B) में कितने फलन हैं?

If \(A=\emptyset\) and \(B=\{1,2,3\}\), how many functions are there from (A) to (B)?

Explanation opens after your attempt
Correct Answer

B. (1)

Step 1

Concept

From the empty domain to any set, there is exactly one empty function. The formula \(|B|^{|A|}=3^0=1\) gives the same result.

Step 2

Why this answer is correct

The correct answer is B. (1). From the empty domain to any set, there is exactly one empty function. The formula \(|B|^{|A|}=3^0=1\) gives the same result.

Step 3

Exam Tip

रिक्त प्रांत से किसी भी समुच्चय में एक ही खाली फलन होता है। सूत्र \(|B|^{|A|}=3^0=1\) भी यही देता है।

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