Hard Mathematics Sets Class 11 Level 9

यदि \(A=\{p,q,r,s\}\), तो (A) के 2 अवयव वाले उपसमुच्चयों की संख्या कितनी है?

If \(A=\{p,q,r,s\}\), how many 2-element subsets of (A) are there?

Explanation opens after your attempt
Correct Answer

C. 6

Step 1

Concept

The number of ways to choose 2 elements is \(\binom{4}{2}=6\). Order is not counted in subsets.

Step 2

Why this answer is correct

The correct answer is C. 6. The number of ways to choose 2 elements is \(\binom{4}{2}=6\). Order is not counted in subsets.

Step 3

Exam Tip

2 अवयव चुनने के तरीके \(\binom{4}{2}=6\) हैं। उपसमुच्चयों में क्रम नहीं गिना जाता।

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Mathematics Answer, Explanation and Revision Hints

यदि \(A=\{p,q,r,s\}\), तो (A) के 2 अवयव वाले उपसमुच्चयों की संख्या कितनी है? / If \(A=\{p,q,r,s\}\), how many 2-element subsets of (A) are there?

Correct Answer: C. 6. Explanation: 2 अवयव चुनने के तरीके \(\binom{4}{2}=6\) हैं। उपसमुच्चयों में क्रम नहीं गिना जाता। / The number of ways to choose 2 elements is \(\binom{4}{2}=6\). Order is not counted in subsets.

Which concept should I revise for this Mathematics MCQ?

The number of ways to choose 2 elements is \(\binom{4}{2}=6\). Order is not counted in subsets.

What exam hint can help solve this Mathematics question?

2 अवयव चुनने के तरीके \(\binom{4}{2}=6\) हैं। उपसमुच्चयों में क्रम नहीं गिना जाता।

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