यदि (A) में (4) अवयव हैं, तो (P(A)) के (2)-अवयवी उपसमुच्चयों की संख्या क्या है?
If (A) has (4) elements, what is the number of (2)-element subsets of (P(A))?
Explanation opens after your attempt
C. (120)
Concept
(P(A)) has \(2^4=16\) elements, so its (2)-element subsets are \(\binom{16}{2}=120\). Treat (P(A)) as a new set here.
Why this answer is correct
The correct answer is C. (120). (P(A)) has \(2^4=16\) elements, so its (2)-element subsets are \(\binom{16}{2}=120\). Treat (P(A)) as a new set here.
Exam Tip
(P(A)) में \(2^4=16\) अवयव हैं, इसलिए इसके (2)-अवयवी उपसमुच्चय \(\binom{16}{2}=120\) हैं। यहां (P(A)) को नया समुच्चय मानें।
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