यदि \(A=\{1,2,3,4\}\), तो (P(A)) के कितने अवयवों में (1) हो या उनका आकार (2) हो?
If \(A=\{1,2,3,4\}\), how many elements of (P(A)) contain (1) or have size (2)?
Explanation opens after your attempt
C. (11)
Concept
Subsets containing (1) are (8), and size (2) subsets are \(\binom{4}{2}=6\). Their overlap is \(\binom{3}{1}=3\), so (8+6-3=11).
Why this answer is correct
The correct answer is C. (11). Subsets containing (1) are (8), and size (2) subsets are \(\binom{4}{2}=6\). Their overlap is \(\binom{3}{1}=3\), so (8+6-3=11).
Exam Tip
(1) वाले उपसमुच्चय (8) हैं और आकार (2) वाले \(\binom{4}{2}=6\) हैं। दोनों में (1) और एक अन्य वाला \(\binom{3}{1}=3\) है, इसलिए (8+6-3=11)।
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