यदि \(A=\{1,2,3,4,5\}\) है तो (A) के दो अवयवों वाले उपसमुच्चयों की संख्या क्या है?
If \(A=\{1,2,3,4,5\}\), how many subsets of (A) have exactly two elements?
Explanation opens after your attempt
Correct Answer
B. (10)
Concept
The number of ways to choose two elements is \(\binom{5}{2}=10\). Order is not counted in subsets.
Why this answer is correct
The correct answer is B. (10). The number of ways to choose two elements is \(\binom{5}{2}=10\). Order is not counted in subsets.
Exam Tip
दो अवयव चुनने की संख्या \(\binom{5}{2}=10\) है। उपसमुच्चय में क्रम नहीं गिना जाता।
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