यदि \(A=\{1,2,3,4\}\) है तो (\mathcal{P}(A)) में कितने उपसमुच्चय (2) को रखते और (3) को नहीं रखते?
If \(A=\{1,2,3,4\}\), how many subsets in (\mathcal{P}(A)) contain (2) and do not contain (3)?
Explanation opens after your attempt
B. (4)
Concept
Taking (2) and not taking (3) are fixed. For remaining (1,4), there are \(2^2=4\) choices.
Why this answer is correct
The correct answer is B. (4). Taking (2) and not taking (3) are fixed. For remaining (1,4), there are \(2^2=4\) choices.
Exam Tip
(2) लेना और (3) न लेना तय है। बाकी (1,4) के लिए \(2^2=4\) विकल्प हैं।
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