यदि \(A=\{1,2,3\}\), तो (\mathcal{P}(A)) में ऐसे कितने तत्व हैं जो (A) के उचित उपसमुच्चय हैं?
If \(A=\{1,2,3\}\), how many elements of (\mathcal{P}(A)) are proper subsets of (A)?
Explanation opens after your attempt
A. (7)
Concept
A set with (3) elements has \(2^3=8\) subsets. A proper subset excludes (A) itself, so there are (7).
Why this answer is correct
The correct answer is A. (7). A set with (3) elements has \(2^3=8\) subsets. A proper subset excludes (A) itself, so there are (7).
Exam Tip
(3) तत्वों वाले समुच्चय के कुल \(2^3=8\) उपसमुच्चय हैं। उचित उपसमुच्चय में स्वयं (A) नहीं आता, इसलिए (7) हैं।
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