यदि \(A=\{p,q,r,s\}\) है तो (A) के दो अवयवों वाले उपसमुच्चयों की संख्या क्या है?
If \(A=\{p,q,r,s\}\), how many subsets of (A) have exactly two elements?
Explanation opens after your attempt
Correct Answer
B. (6)
Concept
The number of ways to choose two elements is \(\binom{4}{2}=6\). Order is not counted in subsets.
Why this answer is correct
The correct answer is B. (6). The number of ways to choose two elements is \(\binom{4}{2}=6\). Order is not counted in subsets.
Exam Tip
दो अवयव चुनने के तरीके \(\binom{4}{2}=6\) हैं। उपसमुच्चय में क्रम नहीं गिना जाता।
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