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