यदि \(A=\{1,2,3,4,5\}\), तो (\mathcal{P}(A)) में ठीक (2) या (3) तत्वों वाले कुल कितने उपसमुच्चय हैं?
If \(A=\{1,2,3,4,5\}\), how many subsets in (\mathcal{P}(A)) have exactly (2) or (3) elements?
Explanation opens after your attempt
A. (20)
Concept
The count is \(\binom{5}{2}+\binom{5}{3}=10+10=20\). In such questions, add the required sizes separately.
Why this answer is correct
The correct answer is A. (20). The count is \(\binom{5}{2}+\binom{5}{3}=10+10=20\). In such questions, add the required sizes separately.
Exam Tip
संख्या \(\binom{5}{2}+\binom{5}{3}=10+10=20\) है। ऐसे प्रश्नों में आकारों को अलग-अलग जोड़ें।
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