यदि \(A=\{a,b,c,d\}\) है, तो (\mathcal{P}(A)) में ठीक (2) तत्वों वाले सदस्यों की संख्या कितनी है?
If \(A=\{a,b,c,d\}\), how many members of (\mathcal{P}(A)) have exactly (2) elements?
Explanation opens after your attempt
Correct Answer
B. (6)
Concept
The number of such subsets is \(\binom{4}{2}=6\). In exams, use \(\binom{n}{r}\) for fixed-size subsets.
Why this answer is correct
The correct answer is B. (6). The number of such subsets is \(\binom{4}{2}=6\). In exams, use \(\binom{n}{r}\) for fixed-size subsets.
Exam Tip
ऐसे subsets की संख्या \(\binom{4}{2}=6\) है। परीक्षा में fixed size subsets के लिए \(\binom{n}{r}\) लगाएं।
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