Class 11 Mathematics Medium Quiz

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यदि \(A=\{1,2,3\}\) और \(B=\{a,b\}\) हैं, तो (A) से (B) तक कुल कितने संबंध संभव हैं?

If \(A=\{1,2,3\}\) and \(B=\{a,b\}\), how many relations are possible from (A) to (B)?

Explanation opens after your attempt
Correct Answer

B. (64)

Step 1

Concept

Since \(A\times B\) has \(3\times2=6\) elements, the number of relations is \(2^6=64\). In exams, count the elements of \(A\times B\) first.

Step 2

Why this answer is correct

The correct answer is B. (64). Since \(A\times B\) has \(3\times2=6\) elements, the number of relations is \(2^6=64\). In exams, count the elements of \(A\times B\) first.

Step 3

Exam Tip

क्योंकि \(A\times B\) में \(3\times2=6\) अवयव हैं, इसलिए संबंधों की संख्या \(2^6=64\) है। परीक्षा में पहले \(A\times B\) के अवयव गिनें।

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यदि \(A=\{1,2,3,4\}\) और संबंध \(R=\{(a,b):a,b\in A,\ a+2=b\}\) है, तो (R) का प्रांत क्या है?

If \(A=\{1,2,3,4\}\) and the relation is \(R=\{(a,b):a,b\in A,\ a+2=b\}\), what is the domain of (R)?

Explanation opens after your attempt
Correct Answer

A. ({1,2})

Step 1

Concept

The condition (a+2=b) gives the ordered pairs ((1,3)) and ((2,4)). Therefore the domain is ({1,2}).

Step 2

Why this answer is correct

The correct answer is A. ({1,2}). The condition (a+2=b) gives the ordered pairs ((1,3)) and ((2,4)). Therefore the domain is ({1,2}).

Step 3

Exam Tip

शर्त (a+2=b) से ordered pairs ((1,3)) और ((2,4)) मिलते हैं। इसलिए प्रांत ({1,2}) है।

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यदि \(A=\{2,4,6\}\) और संबंध \(R=\{(2,4),(4,6),(6,2)\}\) है, तो (R) का प्रांत क्या है?

If \(A=\{2,4,6\}\) and the relation is \(R=\{(2,4),(4,6),(6,2)\}\), what is the domain of (R)?

Explanation opens after your attempt
Correct Answer

A. ({2,4,6})

Step 1

Concept

The domain contains all first components, so it is ({2,4,6}). In exams, look at the first place in each ordered pair.

Step 2

Why this answer is correct

The correct answer is A. ({2,4,6}). The domain contains all first components, so it is ({2,4,6}). In exams, look at the first place in each ordered pair.

Step 3

Exam Tip

प्रांत में सभी प्रथम घटक आते हैं, इसलिए ({2,4,6}) मिलेगा। परीक्षा में ordered pair का पहला स्थान देखें।

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यदि संबंध \(R=\{(1,3),(2,3),(3,5),(4,7)\}\) है, तो (R) का परिसर क्या है?

If the relation is \(R=\{(1,3),(2,3),(3,5),(4,7)\}\), what is the range of (R)?

Explanation opens after your attempt
Correct Answer

B. ({3,5,7})

Step 1

Concept

The range contains second components and repeated entries are removed. Hence ({3,5,7}) is correct.

Step 2

Why this answer is correct

The correct answer is B. ({3,5,7}). The range contains second components and repeated entries are removed. Hence ({3,5,7}) is correct.

Step 3

Exam Tip

परिसर में दूसरे घटक लिए जाते हैं और पुनरावृत्ति हटती है। इसलिए ({3,5,7}) सही है।

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समुच्चय \(A=\{1,2,3\}\) पर \(R=\{(1,1),(2,2),(3,3),(1,2)\}\) संबंध किस प्रकार का है?

On the set \(A=\{1,2,3\}\), which type is the relation \(R=\{(1,1),(2,2),(3,3),(1,2)\}\)?

Explanation opens after your attempt
Correct Answer

A. प्रतिवर्तीReflexive

Step 1

Concept

All ((a,a)) elements are present, so the relation is reflexive. For symmetry, ((2,1)) would also be needed.

Step 2

Why this answer is correct

The correct answer is A. प्रतिवर्ती / Reflexive. All ((a,a)) elements are present, so the relation is reflexive. For symmetry, ((2,1)) would also be needed.

Step 3

Exam Tip

सभी ((a,a)) अवयव मौजूद हैं, इसलिए संबंध प्रतिवर्ती है। सममिति के लिए ((2,1)) भी चाहिए था।

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समुच्चय \(A=\{1,2,3\}\) पर \(R=\{(1,1),(2,2),(1,2),(2,1)\}\) संबंध प्रतिवर्ती क्यों नहीं है?

On \(A=\{1,2,3\}\), why is \(R=\{(1,1),(2,2),(1,2),(2,1)\}\) not reflexive?

Explanation opens after your attempt
Correct Answer

A. क्योंकि ((3,3)) अनुपस्थित हैBecause ((3,3)) is absent

Step 1

Concept

A reflexive relation must contain \((a,a)\in R\) for every \(a\in A\). Here ((3,3)) is missing.

Step 2

Why this answer is correct

The correct answer is A. क्योंकि ((3,3)) अनुपस्थित है / Because ((3,3)) is absent. A reflexive relation must contain \((a,a)\in R\) for every \(a\in A\). Here ((3,3)) is missing.

Step 3

Exam Tip

प्रतिवर्ती संबंध में हर \(a\in A\) के लिए \((a,a)\in R\) होना चाहिए। यहां ((3,3)) नहीं है।

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समुच्चय \(A=\{1,2,3\}\) पर \(R=\{(1,2),(2,1),(2,3),(3,2)\}\) संबंध की सही विशेषता क्या है?

On \(A=\{1,2,3\}\), what is the correct property of \(R=\{(1,2),(2,1),(2,3),(3,2)\}\)?

Explanation opens after your attempt
Correct Answer

A. सममितSymmetric

Step 1

Concept

For every ((a,b)), ((b,a)) is also present, so the relation is symmetric. For reflexivity, ((1,1),(2,2),(3,3)) are also needed.

Step 2

Why this answer is correct

The correct answer is A. सममित / Symmetric. For every ((a,b)), ((b,a)) is also present, so the relation is symmetric. For reflexivity, ((1,1),(2,2),(3,3)) are also needed.

Step 3

Exam Tip

हर ((a,b)) के साथ ((b,a)) भी है, इसलिए संबंध सममित है। प्रतिवर्ती होने के लिए ((1,1),(2,2),(3,3)) भी चाहिए।

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यदि \(R=\{(1,2),(2,3),(1,3),(2,2),(3,3)\}\) है, तो संक्रामिता जांचने में कौन सा युग्म सबसे महत्वपूर्ण है?

If \(R=\{(1,2),(2,3),(1,3),(2,2),(3,3)\}\), which pair is most important while checking transitivity?

Explanation opens after your attempt
Correct Answer

A. ((1,2)) और ((2,3)) से ((1,3))From ((1,2)) and ((2,3)) to ((1,3))

Step 1

Concept

Transitivity needs ((a,b)) and ((b,c)) to imply ((a,c)). Here ((1,2)) and ((2,3)) give ((1,3)).

Step 2

Why this answer is correct

The correct answer is A. ((1,2)) और ((2,3)) से ((1,3)) / From ((1,2)) and ((2,3)) to ((1,3)). Transitivity needs ((a,b)) and ((b,c)) to imply ((a,c)). Here ((1,2)) and ((2,3)) give ((1,3)).

Step 3

Exam Tip

संक्रामिता में ((a,b)) और ((b,c)) से ((a,c)) चाहिए। यहां ((1,2)) और ((2,3)) से ((1,3)) मिलता है।

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समुच्चय \(A=\{1,2,3\}\) पर \(R=\{(1,1),(2,2),(3,3),(1,2),(2,1)\}\) संबंध कैसा है?

On \(A=\{1,2,3\}\), what type is the relation \(R=\{(1,1),(2,2),(3,3),(1,2),(2,1)\}\)?

Explanation opens after your attempt
Correct Answer

A. प्रतिवर्ती और सममितReflexive and symmetric

Step 1

Concept

All ((a,a)) are present and ((2,1)) is present with ((1,2)). So it is reflexive and symmetric.

Step 2

Why this answer is correct

The correct answer is A. प्रतिवर्ती और सममित / Reflexive and symmetric. All ((a,a)) are present and ((2,1)) is present with ((1,2)). So it is reflexive and symmetric.

Step 3

Exam Tip

सभी ((a,a)) मौजूद हैं और ((1,2)) के साथ ((2,1)) भी है। इसलिए यह प्रतिवर्ती और सममित है।

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समुच्चय \(A=\{1,2,3,4\}\) पर (aRb) यदि \(a\le b\) है, तो यह संबंध कौन सा गुण अवश्य रखता है?

On \(A=\{1,2,3,4\}\), if (aRb) means \(a\le b\), which property must this relation have?

Explanation opens after your attempt
Correct Answer

A. प्रतिवर्ती और संक्रामीReflexive and transitive

Step 1

Concept

Since \(a\le a\) is true and \(a\le b,\ b\le c\) gives \(a\le c\). It is generally not symmetric.

Step 2

Why this answer is correct

The correct answer is A. प्रतिवर्ती और संक्रामी / Reflexive and transitive. Since \(a\le a\) is true and \(a\le b,\ b\le c\) gives \(a\le c\). It is generally not symmetric.

Step 3

Exam Tip

क्योंकि \(a\le a\) सत्य है और \(a\le b,\ b\le c\) से \(a\le c\) मिलता है। यह सामान्यतः सममित नहीं है।

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समुच्चय \(A=\{1,2,3,4,5\}\) पर (aRb) यदि (a-b) सम संख्या है, तो (R) कैसा है?

On \(A=\{1,2,3,4,5\}\), if (aRb) when (a-b) is even, what type of relation is (R)?

Explanation opens after your attempt
Correct Answer

A. समतुल्य संबंधEquivalence relation

Step 1

Concept

The evenness of (a-b) gives reflexive, symmetric, and transitive properties. Hence it is an equivalence relation.

Step 2

Why this answer is correct

The correct answer is A. समतुल्य संबंध / Equivalence relation. The evenness of (a-b) gives reflexive, symmetric, and transitive properties. Hence it is an equivalence relation.

Step 3

Exam Tip

(a-b) का सम होना प्रतिवर्ती, सममित और संक्रामी तीनों गुण देता है। इसलिए यह समतुल्य संबंध है।

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यदि \(A=\{1,2,3,4\}\) और (aRb) का अर्थ (a) divides (b) है, तो (R) में कौन सा ordered pair नहीं होगा?

If \(A=\{1,2,3,4\}\) and (aRb) means (a) divides (b), which ordered pair will not be in (R)?

Explanation opens after your attempt
Correct Answer

C. ((3,1))

Step 1

Concept

Since (3) does not divide (1). While checking options, first notice the direction of divisibility.

Step 2

Why this answer is correct

The correct answer is C. ((3,1)). Since (3) does not divide (1). While checking options, first notice the direction of divisibility.

Step 3

Exam Tip

क्योंकि (3) संख्या (1) को विभाजित नहीं करती। विकल्प जांचते समय पहले विभाज्यता की दिशा देखें।

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यदि \(R=\{(x,y):x,y\in {1,2,3,4},\ x+y=5\}\), तो (R) में कितने ordered pairs हैं?

If \(R=\{(x,y):x,y\in {1,2,3,4},\ x+y=5\}\), how many ordered pairs are in (R)?

Explanation opens after your attempt
Correct Answer

C. (4)

Step 1

Concept

The pairs are ((1,4),(2,3),(3,2),(4,1)). The total number is (4).

Step 2

Why this answer is correct

The correct answer is C. (4). The pairs are ((1,4),(2,3),(3,2),(4,1)). The total number is (4).

Step 3

Exam Tip

युग्म ((1,4),(2,3),(3,2),(4,1)) मिलते हैं। कुल संख्या (4) है।

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यदि \(R=\{(a,b):a,b\in {1,2,3,4},\ a<b\}\), तो (R) का परिसर क्या है?

If \(R=\{(a,b):a,b\in {1,2,3,4},\ a<b\}\), what is the range of (R)?

Explanation opens after your attempt
Correct Answer

B. ({2,3,4})

Step 1

Concept

The second component can be (2,3,4). Therefore the range is ({2,3,4}).

Step 2

Why this answer is correct

The correct answer is B. ({2,3,4}). The second component can be (2,3,4). Therefore the range is ({2,3,4}).

Step 3

Exam Tip

दूसरे घटक के रूप में (2,3,4) आ सकते हैं। इसलिए परिसर ({2,3,4}) है।

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यदि \(A=\{1,2,3\}\) और \(R=\{(1,2),(2,3)\}\), तो \(R^{-1}\) क्या है?

If \(A=\{1,2,3\}\) and \(R=\{(1,2),(2,3)\}\), what is \(R^{-1}\)?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

In the inverse relation, the components of each ordered pair are reversed. Thus ((1,2)) gives ((2,1)) and ((2,3)) gives ((3,2)).

Step 2

Why this answer is correct

The correct answer is A. ({(2,1),(3,2)}). In the inverse relation, the components of each ordered pair are reversed. Thus ((1,2)) gives ((2,1)) and ((2,3)) gives ((3,2)).

Step 3

Exam Tip

व्युत्क्रम संबंध में हर ordered pair के घटक उलट जाते हैं। इसलिए ((1,2)) से ((2,1)) और ((2,3)) से ((3,2)) मिलेगा।

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यदि (R) सममित है और \((5,8)\in R\), तो कौन सा कथन निश्चित रूप से सत्य है?

If (R) is symmetric and \((5,8)\in R\), which statement is definitely true?

Explanation opens after your attempt
Correct Answer

A. \((8,5)\in R\)

Step 1

Concept

In a symmetric relation, \((a,b)\in R\) implies \((b,a)\in R\). So \((8,5)\in R\) is certain.

Step 2

Why this answer is correct

The correct answer is A. \((8,5)\in R\). In a symmetric relation, \((a,b)\in R\) implies \((b,a)\in R\). So \((8,5)\in R\) is certain.

Step 3

Exam Tip

सममित संबंध में \((a,b)\in R\) होने पर \((b,a)\in R\) भी होता है। इसलिए \((8,5)\in R\) निश्चित है।

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यदि (R) संक्रामी है और \((1,4)\in R,\ (4,7)\in R\), तो कौन सा ordered pair आवश्यक है?

If (R) is transitive and \((1,4)\in R,\ (4,7)\in R\), which ordered pair is necessary?

Explanation opens after your attempt
Correct Answer

A. ((1,7))

Step 1

Concept

In transitivity, when the middle component is common, ((a,c)) is required. Therefore ((1,7)) is necessary.

Step 2

Why this answer is correct

The correct answer is A. ((1,7)). In transitivity, when the middle component is common, ((a,c)) is required. Therefore ((1,7)) is necessary.

Step 3

Exam Tip

संक्रामिता में बीच वाला घटक समान हो तो ((a,c)) चाहिए। इसलिए ((1,7)) आवश्यक है।

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समुच्चय \(A=\{1,2,3\}\) पर केवल प्रतिवर्ती होने के लिए किसी संबंध में न्यूनतम कितने ordered pairs होने चाहिए?

On \(A=\{1,2,3\}\), what is the minimum number of ordered pairs needed for a relation to be reflexive?

Explanation opens after your attempt
Correct Answer

C. (3)

Step 1

Concept

A reflexive relation must contain ((1,1),(2,2),(3,3)). Hence the minimum number is (3).

Step 2

Why this answer is correct

The correct answer is C. (3). A reflexive relation must contain ((1,1),(2,2),(3,3)). Hence the minimum number is (3).

Step 3

Exam Tip

प्रतिवर्ती संबंध में ((1,1),(2,2),(3,3)) आवश्यक हैं। इसलिए न्यूनतम (3) ordered pairs चाहिए।

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समुच्चय (A) में (4) अवयव हैं। (A) पर प्रतिवर्ती संबंधों की संख्या कितनी है?

The set (A) has (4) elements. How many reflexive relations are there on (A)?

Explanation opens after your attempt
Correct Answer

A. \(2^{12}\)

Step 1

Concept

\(A\times A\) has (16) pairs and (4) diagonal pairs are compulsory. The remaining (12) pairs are free, so the number is \(2^{12}\).

Step 2

Why this answer is correct

The correct answer is A. \(2^{12}\). \(A\times A\) has (16) pairs and (4) diagonal pairs are compulsory. The remaining (12) pairs are free, so the number is \(2^{12}\).

Step 3

Exam Tip

\(A\times A\) में (16) युग्म हैं और (4) diagonal युग्म अनिवार्य हैं। शेष (12) युग्म स्वतंत्र हैं, इसलिए संख्या \(2^{12}\) है।

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समुच्चय \(A=\{1,2\}\) पर कुल कितने संबंध संभव हैं?

How many total relations are possible on the set \(A=\{1,2\}\)?

Explanation opens after your attempt
Correct Answer

C. (16)

Step 1

Concept

\(A\times A\) has \(2^2=4\) ordered pairs. The total number of relations is \(2^4=16\).

Step 2

Why this answer is correct

The correct answer is C. (16). \(A\times A\) has \(2^2=4\) ordered pairs. The total number of relations is \(2^4=16\).

Step 3

Exam Tip

\(A\times A\) में \(2^2=4\) ordered pairs होते हैं। कुल संबंधों की संख्या \(2^4=16\) है।

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समुच्चय \(A=\{1,2,3\}\) पर रिक्त संबंध के बारे में कौन सा कथन सही है?

Which statement is correct about the empty relation on \(A=\{1,2,3\}\)?

Explanation opens after your attempt
Correct Answer

B. यह सममित हैIt is symmetric

Step 1

Concept

The empty relation has no pair that violates symmetry. But it is not reflexive because ((1,1),(2,2),(3,3)) are absent.

Step 2

Why this answer is correct

The correct answer is B. यह सममित है / It is symmetric. The empty relation has no pair that violates symmetry. But it is not reflexive because ((1,1),(2,2),(3,3)) are absent.

Step 3

Exam Tip

रिक्त संबंध में सममिति की शर्त का विरोध करने वाला कोई युग्म नहीं है। लेकिन यह प्रतिवर्ती नहीं है क्योंकि ((1,1),(2,2),(3,3)) नहीं हैं।

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समुच्चय \(A=\{1,2\}\) पर सार्वत्रिक संबंध कौन सा है?

Which is the universal relation on \(A=\{1,2\}\)?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

The universal relation is equal to \(A\times A\). Therefore it contains all (4) ordered pairs.

Step 2

Why this answer is correct

The correct answer is A. ({(1,1),(1,2),(2,1),(2,2)}). The universal relation is equal to \(A\times A\). Therefore it contains all (4) ordered pairs.

Step 3

Exam Tip

सार्वत्रिक संबंध \(A\times A\) के बराबर होता है। इसलिए इसमें सभी (4) ordered pairs होंगे।

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यदि \(R=\{(x,x):x\in A\}\), तो (R) को क्या कहते हैं?

If \(R=\{(x,x):x\in A\}\), what is (R) called?

Explanation opens after your attempt
Correct Answer

A. सर्वसम संबंधIdentity relation

Step 1

Concept

In this relation, each element is related only to itself. It is called the identity relation.

Step 2

Why this answer is correct

The correct answer is A. सर्वसम संबंध / Identity relation. In this relation, each element is related only to itself. It is called the identity relation.

Step 3

Exam Tip

ऐसे संबंध में हर अवयव केवल स्वयं से संबंधित होता है। इसे सर्वसम संबंध कहते हैं।

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यदि \(A=\{1,2,3,4\}\) और \(R=\{(a,b):a=b\}\), तो (R) में कितने ordered pairs हैं?

If \(A=\{1,2,3,4\}\) and \(R=\{(a,b):a=b\}\), how many ordered pairs are in (R)?

Explanation opens after your attempt
Correct Answer

B. (4)

Step 1

Concept

The condition (a=b) gives only diagonal pairs. For (4) elements, there are (4) ordered pairs.

Step 2

Why this answer is correct

The correct answer is B. (4). The condition (a=b) gives only diagonal pairs. For (4) elements, there are (4) ordered pairs.

Step 3

Exam Tip

शर्त (a=b) केवल diagonal युग्म देती है। (4) अवयवों के लिए (4) ordered pairs मिलेंगे।

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यदि \(A=\{1,2,3\}\) और \(B=\{4,5\}\), तो \(A\times B\) के किसी उपसमुच्चय को क्या कहा जा सकता है?

If \(A=\{1,2,3\}\) and \(B=\{4,5\}\), what can any subset of \(A\times B\) be called?

Explanation opens after your attempt
Correct Answer

A. (A) से (B) तक संबंधRelation from (A) to (B)

Step 1

Concept

Any subset of \(A\times B\) is a relation from (A) to (B). It need not be a function.

Step 2

Why this answer is correct

The correct answer is A. (A) से (B) तक संबंध / Relation from (A) to (B). Any subset of \(A\times B\) is a relation from (A) to (B). It need not be a function.

Step 3

Exam Tip

\(A\times B\) का कोई भी उपसमुच्चय (A) से (B) तक संबंध कहलाता है। यह जरूरी नहीं कि फलन हो।

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यदि \((p,q)\in A\times B\), तो (p) और (q) के बारे में सही कथन क्या है?

If \((p,q)\in A\times B\), which statement about (p) and (q) is correct?

Explanation opens after your attempt
Correct Answer

A. \(p\in A\) और \(q\in B\)\(p\in A\) and \(q\in B\)

Step 1

Concept

In a Cartesian product, the first component comes from the first set and the second from the second set. Therefore \(p\in A\) and \(q\in B\).

Step 2

Why this answer is correct

The correct answer is A. \(p\in A\) और \(q\in B\) / \(p\in A\) and \(q\in B\). In a Cartesian product, the first component comes from the first set and the second from the second set. Therefore \(p\in A\) and \(q\in B\).

Step 3

Exam Tip

कार्टेशियन गुणन में पहला घटक पहले समुच्चय से और दूसरा घटक दूसरे समुच्चय से आता है। इसलिए \(p\in A\) और \(q\in B\) है।

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समुच्चय \(A=\{1,2,3,4\}\) पर (aRb) यदि (a+b) विषम है, तो संबंध की सही विशेषता क्या है?

On \(A=\{1,2,3,4\}\), if (aRb) when (a+b) is odd, what is the correct property of the relation?

Explanation opens after your attempt
Correct Answer

A. सममित लेकिन प्रतिवर्ती नहींSymmetric but not reflexive

Step 1

Concept

If (a+b) is odd, then (b+a) is also odd, so it is symmetric. But (a+a) is even, so it is not reflexive.

Step 2

Why this answer is correct

The correct answer is A. सममित लेकिन प्रतिवर्ती नहीं / Symmetric but not reflexive. If (a+b) is odd, then (b+a) is also odd, so it is symmetric. But (a+a) is even, so it is not reflexive.

Step 3

Exam Tip

यदि (a+b) विषम है तो (b+a) भी विषम है, इसलिए सममित है। लेकिन (a+a) सम होता है, इसलिए प्रतिवर्ती नहीं है।

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यदि \(R=\{(1,1),(1,2),(2,2)\}\) समुच्चय \(A=\{1,2\}\) पर है, तो (R) कौन सा गुण रखता है?

If \(R=\{(1,1),(1,2),(2,2)\}\) is on \(A=\{1,2\}\), which property does (R) have?

Explanation opens after your attempt
Correct Answer

A. प्रतिवर्ती और संक्रामीReflexive and transitive

Step 1

Concept

It is reflexive because ((1,1)) and ((2,2)) are present. The pair ((1,2)) causes no violation of transitivity, so it is also transitive.

Step 2

Why this answer is correct

The correct answer is A. प्रतिवर्ती और संक्रामी / Reflexive and transitive. It is reflexive because ((1,1)) and ((2,2)) are present. The pair ((1,2)) causes no violation of transitivity, so it is also transitive.

Step 3

Exam Tip

((1,1)) और ((2,2)) होने से यह प्रतिवर्ती है। ((1,2)) के कारण कोई संक्रामिता भंग नहीं होती, इसलिए यह संक्रामी भी है।

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यदि \(R=\{(1,2),(2,1)\}\) समुच्चय \(A=\{1,2\}\) पर है, तो कौन सा कथन सही है?

If \(R=\{(1,2),(2,1)\}\) is on \(A=\{1,2\}\), which statement is correct?

Explanation opens after your attempt
Correct Answer

A. यह सममित है लेकिन प्रतिवर्ती नहींIt is symmetric but not reflexive

Step 1

Concept

Both ((1,2)) and ((2,1)) are present, so it is symmetric. But ((1,1)) and ((2,2)) are absent, so it is not reflexive.

Step 2

Why this answer is correct

The correct answer is A. यह सममित है लेकिन प्रतिवर्ती नहीं / It is symmetric but not reflexive. Both ((1,2)) and ((2,1)) are present, so it is symmetric. But ((1,1)) and ((2,2)) are absent, so it is not reflexive.

Step 3

Exam Tip

((1,2)) और ((2,1)) दोनों हैं, इसलिए सममित है। लेकिन ((1,1)) और ((2,2)) नहीं हैं, इसलिए प्रतिवर्ती नहीं है।

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समुच्चय \(A=\{1,2,3\}\) पर \(R=\{(1,1),(2,2),(3,3),(1,2),(2,3)\}\) क्यों संक्रामी नहीं है?

On \(A=\{1,2,3\}\), why is \(R=\{(1,1),(2,2),(3,3),(1,2),(2,3)\}\) not transitive?

Explanation opens after your attempt
Correct Answer

A. क्योंकि ((1,3)) अनुपस्थित हैBecause ((1,3)) is absent

Step 1

Concept

Since ((1,2)) and ((2,3)) are present, transitivity requires ((1,3)). It is absent.

Step 2

Why this answer is correct

The correct answer is A. क्योंकि ((1,3)) अनुपस्थित है / Because ((1,3)) is absent. Since ((1,2)) and ((2,3)) are present, transitivity requires ((1,3)). It is absent.

Step 3

Exam Tip

((1,2)) और ((2,3)) हैं, इसलिए संक्रामिता के लिए ((1,3)) होना चाहिए। यह अनुपस्थित है।

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यदि \(A=\{1,2,3,4,5,6\}\) और (aRb) यदि \(a\equiv b \pmod{3}\), तो (1) का समतुल्यता वर्ग क्या है?

If \(A=\{1,2,3,4,5,6\}\) and (aRb) if \(a\equiv b \pmod{3}\), what is the equivalence class of (1)?

Explanation opens after your attempt
Correct Answer

A. ({1,4})

Step 1

Concept

The numbers with the same remainder as (1) modulo (3) are (1) and (4). Hence the class is ({1,4}).

Step 2

Why this answer is correct

The correct answer is A. ({1,4}). The numbers with the same remainder as (1) modulo (3) are (1) and (4). Hence the class is ({1,4}).

Step 3

Exam Tip

(1) से \( \pmod{3}\) में समान शेष देने वाली संख्याएं (1) और (4) हैं। इसलिए वर्ग ({1,4}) है।

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यदि \(A=\{0,1,2,3,4\}\) और (aRb) यदि \(a^2=b^2\), तो (R) में कितने ordered pairs हैं?

If \(A=\{0,1,2,3,4\}\) and (aRb) if \(a^2=b^2\), how many ordered pairs are in (R)?

Explanation opens after your attempt
Correct Answer

A. (5)

Step 1

Concept

All elements in the given set are non-negative, so \(a^2=b^2\) gives (a=b). Therefore only (5) diagonal pairs exist.

Step 2

Why this answer is correct

The correct answer is A. (5). All elements in the given set are non-negative, so \(a^2=b^2\) gives (a=b). Therefore only (5) diagonal pairs exist.

Step 3

Exam Tip

दिए गए समुच्चय में सभी अवयव अनऋण हैं, इसलिए \(a^2=b^2\) से (a=b) मिलता है। इसलिए केवल (5) diagonal युग्म हैं।

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यदि \(A=\{-2,-1,0,1,2\}\) और (aRb) यदि \(a^2=b^2\), तो (R) में कौन सा ordered pair होगा?

If \(A=\{-2,-1,0,1,2\}\) and (aRb) if \(a^2=b^2\), which ordered pair will be in (R)?

Explanation opens after your attempt
Correct Answer

A. ((-2,2))

Step 1

Concept

Since ((-2)2=22=4), \((-2,2)\in R\). In square conditions, also check opposite signs.

Step 2

Why this answer is correct

The correct answer is A. ((-2,2)). Since ((-2)2=22=4), \((-2,2)\in R\). In square conditions, also check opposite signs.

Step 3

Exam Tip

क्योंकि ((-2)2=22=4), इसलिए \((-2,2)\in R\)। वर्ग वाली शर्त में विपरीत चिह्न भी जांचें।

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यदि \(A=\{1,2,3,4,6\}\) और (aRb) यदि \(a\mid b\), तो कौन सा कथन सही है?

If \(A=\{1,2,3,4,6\}\) and (aRb) if \(a\mid b\), which statement is correct?

Explanation opens after your attempt
Correct Answer

A. (R) प्रतिवर्ती और संक्रामी है(R) is reflexive and transitive

Step 1

Concept

Every (a) divides itself and \(a\mid b,\ b\mid c\) imply \(a\mid c\). Hence it is reflexive and transitive.

Step 2

Why this answer is correct

The correct answer is A. (R) प्रतिवर्ती और संक्रामी है / (R) is reflexive and transitive. Every (a) divides itself and \(a\mid b,\ b\mid c\) imply \(a\mid c\). Hence it is reflexive and transitive.

Step 3

Exam Tip

हर (a) अपने को विभाजित करता है और \(a\mid b,\ b\mid c\) से \(a\mid c\) मिलता है। इसलिए यह प्रतिवर्ती और संक्रामी है।

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समुच्चय \(A=\{1,2,3\}\) पर \(R=\{(1,1),(2,2),(3,3)\}\) के लिए सही कथन क्या है?

For \(R=\{(1,1),(2,2),(3,3)\}\) on \(A=\{1,2,3\}\), which statement is correct?

Explanation opens after your attempt
Correct Answer

A. यह प्रतिवर्ती, सममित और संक्रामी हैIt is reflexive, symmetric, and transitive

Step 1

Concept

It is the identity relation, so it has all three properties. Such a relation is also an equivalence relation.

Step 2

Why this answer is correct

The correct answer is A. यह प्रतिवर्ती, सममित और संक्रामी है / It is reflexive, symmetric, and transitive. It is the identity relation, so it has all three properties. Such a relation is also an equivalence relation.

Step 3

Exam Tip

यह सर्वसम संबंध है, इसलिए तीनों गुण रखता है। ऐसे संबंध को समतुल्य भी कहा जा सकता है।

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यदि (R) समतुल्य संबंध है, तो उसमें कौन से तीन गुण अवश्य होंगे?

If (R) is an equivalence relation, which three properties must it have?

Explanation opens after your attempt
Correct Answer

A. प्रतिवर्ती, सममित, संक्रामीReflexive, symmetric, transitive

Step 1

Concept

The definition of equivalence relation includes reflexive, symmetric, and transitive properties. In exams, check all three separately.

Step 2

Why this answer is correct

The correct answer is A. प्रतिवर्ती, सममित, संक्रामी / Reflexive, symmetric, transitive. The definition of equivalence relation includes reflexive, symmetric, and transitive properties. In exams, check all three separately.

Step 3

Exam Tip

समतुल्य संबंध की परिभाषा में प्रतिवर्ती, सममित और संक्रामी तीनों गुण आते हैं। परीक्षा में इन तीनों को अलग-अलग जांचें।

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यदि \(A=\{1,2,3,4\}\) और \(R=\{(a,b):a+b\le 5\}\), तो ((4,2)) के बारे में क्या सही है?

If \(A=\{1,2,3,4\}\) and \(R=\{(a,b):a+b\le 5\}\), what is correct about ((4,2))?

Explanation opens after your attempt
Correct Answer

A. \((4,2)\notin R\)

Step 1

Concept

Since (4+2=6) and \(6\le 5\) is false. Therefore \((4,2)\notin R\).

Step 2

Why this answer is correct

The correct answer is A. \((4,2)\notin R\). Since (4+2=6) and \(6\le 5\) is false. Therefore \((4,2)\notin R\).

Step 3

Exam Tip

क्योंकि (4+2=6) और \(6\le 5\) असत्य है। इसलिए \((4,2)\notin R\)।

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यदि \(A=\{1,2,3,4,5\}\) और \(R=\{(a,b):|a-b|=1\}\), तो (R) की सही विशेषता क्या है?

If \(A=\{1,2,3,4,5\}\) and \(R=\{(a,b):|a-b|=1\}\), what is the correct property of (R)?

Explanation opens after your attempt
Correct Answer

A. सममित लेकिन प्रतिवर्ती नहींSymmetric but not reflexive

Step 1

Concept

If (|a-b|=1), then (|b-a|=1) too, so it is symmetric. But (|a-a|=0), so it is not reflexive.

Step 2

Why this answer is correct

The correct answer is A. सममित लेकिन प्रतिवर्ती नहीं / Symmetric but not reflexive. If (|a-b|=1), then (|b-a|=1) too, so it is symmetric. But (|a-a|=0), so it is not reflexive.

Step 3

Exam Tip

यदि (|a-b|=1), तो (|b-a|=1) भी है, इसलिए सममित है। लेकिन (|a-a|=0), इसलिए प्रतिवर्ती नहीं है।

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यदि \(R=\{(1,2),(2,1),(1,1)\}\) समुच्चय \(A=\{1,2\}\) पर है, तो कौन सा युग्म जोड़ने पर (R) प्रतिवर्ती हो जाएगा?

If \(R=\{(1,2),(2,1),(1,1)\}\) is on \(A=\{1,2\}\), which pair should be added to make (R) reflexive?

Explanation opens after your attempt
Correct Answer

A. ((2,2))

Step 1

Concept

To be reflexive, both ((1,1)) and ((2,2)) are needed. ((1,1)) is already present, so ((2,2)) must be added.

Step 2

Why this answer is correct

The correct answer is A. ((2,2)). To be reflexive, both ((1,1)) and ((2,2)) are needed. ((1,1)) is already present, so ((2,2)) must be added.

Step 3

Exam Tip

प्रतिवर्ती होने के लिए ((1,1)) और ((2,2)) दोनों चाहिए। ((1,1)) पहले से है, इसलिए ((2,2)) जोड़ना होगा।

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यदि \(R=\{(1,2),(2,3),(1,3)\}\), तो (R) का प्रांत क्या है?

If \(R=\{(1,2),(2,3),(1,3)\}\), what is the domain of (R)?

Explanation opens after your attempt
Correct Answer

A. ({1,2})

Step 1

Concept

Only first components are taken in the domain. Here the first components are (1) and (2).

Step 2

Why this answer is correct

The correct answer is A. ({1,2}). Only first components are taken in the domain. Here the first components are (1) and (2).

Step 3

Exam Tip

प्रांत में केवल प्रथम घटक लिए जाते हैं। यहां प्रथम घटक (1) और (2) हैं।

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यदि \(R=\{(1,2),(2,3),(1,3)\}\), तो (R) का परिसर क्या है?

If \(R=\{(1,2),(2,3),(1,3)\}\), what is the range of (R)?

Explanation opens after your attempt
Correct Answer

B. ({2,3})

Step 1

Concept

Second components are taken in the range. Here the second components are (2) and (3).

Step 2

Why this answer is correct

The correct answer is B. ({2,3}). Second components are taken in the range. Here the second components are (2) and (3).

Step 3

Exam Tip

परिसर में दूसरे घटक लिए जाते हैं। यहां दूसरे घटक (2) और (3) हैं।

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यदि \(A=\{1,2,3\}\), \(B=\{x,y\}\) और \(R=\{(1,x),(3,y)\}\), तो (R) का सहप्रांत क्या है?

If \(A=\{1,2,3\}\), \(B=\{x,y\}\), and \(R=\{(1,x),(3,y)\}\), what is the codomain of (R)?

Explanation opens after your attempt
Correct Answer

A. ({x,y})

Step 1

Concept

For a relation from (A) to (B), the codomain is the whole set (B). Here \(B=\{x,y\}\).

Step 2

Why this answer is correct

The correct answer is A. ({x,y}). For a relation from (A) to (B), the codomain is the whole set (B). Here \(B=\{x,y\}\).

Step 3

Exam Tip

(A) से (B) तक संबंध में सहप्रांत पूरा (B) होता है। यहां \(B=\{x,y\}\) है।

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यदि किसी संबंध का परिसर ({p,q}) है और सहप्रांत ({p,q,r}) है, तो कौन सा कथन सही है?

If the range of a relation is ({p,q}) and the codomain is ({p,q,r}), which statement is correct?

Explanation opens after your attempt
Correct Answer

A. परिसर सहप्रांत का उपसमुच्चय हैRange is a subset of codomain

Step 1

Concept

The range is always a subset of the codomain. They need not be equal.

Step 2

Why this answer is correct

The correct answer is A. परिसर सहप्रांत का उपसमुच्चय है / Range is a subset of codomain. The range is always a subset of the codomain. They need not be equal.

Step 3

Exam Tip

परिसर हमेशा सहप्रांत का उपसमुच्चय होता है। दोनों बराबर होना जरूरी नहीं है।

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यदि \(R\subseteq A\times B\) और (|A|=2,\ |B|=5), तो (R) में अधिकतम कितने ordered pairs हो सकते हैं?

If \(R\subseteq A\times B\) and (|A|=2,\ |B|=5), what is the maximum number of ordered pairs in (R)?

Explanation opens after your attempt
Correct Answer

C. (10)

Step 1

Concept

The maximum relation can be the whole \(A\times B\). Therefore the maximum number of pairs is \(2\times5=10\).

Step 2

Why this answer is correct

The correct answer is C. (10). The maximum relation can be the whole \(A\times B\). Therefore the maximum number of pairs is \(2\times5=10\).

Step 3

Exam Tip

अधिकतम संबंध पूरा \(A\times B\) हो सकता है। इसलिए अधिकतम युग्म \(2\times5=10\) होंगे।

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यदि \(A=\{1,2,3\}\) और \(B=\{4,5,6\}\), तो \(R=\{(a,b):b=a+3\}\) में कितने ordered pairs हैं?

If \(A=\{1,2,3\}\) and \(B=\{4,5,6\}\), how many ordered pairs are in \(R=\{(a,b):b=a+3\}\)?

Explanation opens after your attempt
Correct Answer

B. (3)

Step 1

Concept

The pairs are ((1,4),(2,5),(3,6)). Therefore there are (3) ordered pairs.

Step 2

Why this answer is correct

The correct answer is B. (3). The pairs are ((1,4),(2,5),(3,6)). Therefore there are (3) ordered pairs.

Step 3

Exam Tip

युग्म ((1,4),(2,5),(3,6)) मिलते हैं। इसलिए कुल (3) ordered pairs हैं।

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यदि \(R=\{(a,b):a,b\in {1,2,3,4},\ ab=4\}\), तो कौन सा ordered pair (R) में है?

If \(R=\{(a,b):a,b\in {1,2,3,4},\ ab=4\}\), which ordered pair is in (R)?

Explanation opens after your attempt
Correct Answer

A. ((1,4))

Step 1

Concept

For ((1,4)), \(1\cdot4=4\), so it is in (R). The other options do not have product (4).

Step 2

Why this answer is correct

The correct answer is A. ((1,4)). For ((1,4)), \(1\cdot4=4\), so it is in (R). The other options do not have product (4).

Step 3

Exam Tip

((1,4)) के लिए \(1\cdot4=4\), इसलिए यह (R) में है। दूसरे विकल्पों में गुणनफल (4) नहीं है।

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यदि \(R=\{(1,1),(1,2),(2,1),(2,2)\}\) समुच्चय \(A=\{1,2\}\) पर है, तो (R) कैसा है?

If \(R=\{(1,1),(1,2),(2,1),(2,2)\}\) is on \(A=\{1,2\}\), what type is (R)?

Explanation opens after your attempt
Correct Answer

A. सार्वत्रिक और समतुल्यUniversal and equivalence

Step 1

Concept

It contains all pairs of \(A\times A\), so it is universal. It is also reflexive, symmetric, and transitive.

Step 2

Why this answer is correct

The correct answer is A. सार्वत्रिक और समतुल्य / Universal and equivalence. It contains all pairs of \(A\times A\), so it is universal. It is also reflexive, symmetric, and transitive.

Step 3

Exam Tip

यह \(A\times A\) के सभी युग्म रखता है, इसलिए सार्वत्रिक है। यह प्रतिवर्ती, सममित और संक्रामी भी है।

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यदि (R) प्रतिसममित है और \((3,5)\in R\), तो कौन सा निष्कर्ष सही है?

If (R) is antisymmetric and \((3,5)\in R\), which conclusion is correct?

Explanation opens after your attempt
Correct Answer

A. \((5,3)\in R\) नहीं हो सकता\((5,3)\in R\) cannot occur

Step 1

Concept

In an antisymmetric relation, for distinct (a) and (b), both ((a,b)) and ((b,a)) cannot occur together. Since \(3\ne5\), ((5,3)) cannot occur.

Step 2

Why this answer is correct

The correct answer is A. \((5,3)\in R\) नहीं हो सकता / \((5,3)\in R\) cannot occur. In an antisymmetric relation, for distinct (a) and (b), both ((a,b)) and ((b,a)) cannot occur together. Since \(3\ne5\), ((5,3)) cannot occur.

Step 3

Exam Tip

प्रतिसममित संबंध में अलग-अलग (a) और (b) के लिए दोनों ((a,b)) और ((b,a)) साथ नहीं हो सकते। क्योंकि \(3\ne5\), ((5,3)) नहीं हो सकता।

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समुच्चय \(A=\{1,2,3\}\) पर \(R=\{(1,1),(2,2),(3,3),(1,2)\}\) के लिए कौन सा कथन सही है?

For \(R=\{(1,1),(2,2),(3,3),(1,2)\}\) on \(A=\{1,2,3\}\), which statement is correct?

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Correct Answer

A. यह प्रतिवर्ती और प्रतिसममित हैIt is reflexive and antisymmetric

Step 1

Concept

All diagonal pairs are present, so it is reflexive. Since ((2,1)) is absent, ((1,2)) does not break antisymmetry.

Step 2

Why this answer is correct

The correct answer is A. यह प्रतिवर्ती और प्रतिसममित है / It is reflexive and antisymmetric. All diagonal pairs are present, so it is reflexive. Since ((2,1)) is absent, ((1,2)) does not break antisymmetry.

Step 3

Exam Tip

सभी diagonal युग्म हैं, इसलिए यह प्रतिवर्ती है। ((2,1)) नहीं है, इसलिए ((1,2)) से प्रतिसममिति नहीं टूटती।

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यदि \(A=\{1,2,3,4\}\) और \(R=\{(a,b):a\ge b\}\), तो (R) के लिए सही कथन क्या है?

If \(A=\{1,2,3,4\}\) and \(R=\{(a,b):a\ge b\}\), which statement about (R) is correct?

Explanation opens after your attempt
Correct Answer

A. प्रतिवर्ती, प्रतिसममित और संक्रामीReflexive, antisymmetric, and transitive

Step 1

Concept

Because \(a\ge a\) is true, and \(a\ge b,\ b\ge c\) imply \(a\ge c\). Also \(a\ge b\) and \(b\ge a\) imply (a=b).

Step 2

Why this answer is correct

The correct answer is A. प्रतिवर्ती, प्रतिसममित और संक्रामी / Reflexive, antisymmetric, and transitive. Because \(a\ge a\) is true, and \(a\ge b,\ b\ge c\) imply \(a\ge c\). Also \(a\ge b\) and \(b\ge a\) imply (a=b).

Step 3

Exam Tip

क्योंकि \(a\ge a\) सत्य है, और \(a\ge b,\ b\ge c\) से \(a\ge c\) मिलता है। साथ ही \(a\ge b\) और \(b\ge a\) से (a=b) होता है।

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Class 11 Mathematics Quiz FAQs

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