यदि \(A=\{1,2,3,4\}\), तो (\mathcal{P}(A)) के कितने तत्वों का अधिकतम तत्व (3) है?
If \(A=\{1,2,3,4\}\), how many elements of (\mathcal{P}(A)) have maximum element (3)?
Explanation opens after your attempt
B. (4)
Concept
Such a subset must contain (3) and must not contain (4). (1,2) are free, so there are \(2^2=4\) subsets.
Why this answer is correct
The correct answer is B. (4). Such a subset must contain (3) and must not contain (4). (1,2) are free, so there are \(2^2=4\) subsets.
Exam Tip
ऐसे उपसमुच्चय में (3) होना चाहिए और (4) नहीं होना चाहिए। (1,2) स्वतंत्र हैं, इसलिए \(2^2=4\) उपसमुच्चय हैं।
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