यदि \(A=\{a,b,c,d,e\}\), तो \(\mathcal{P}(A)\) में ऐसे कितने उपसमुच्चय हैं जिनमें (a) है और (b) तथा (c) दोनों नहीं हैं?
If \(A=\{a,b,c,d,e\}\), how many subsets in \(\mathcal{P}(A)\) contain (a) and contain neither (b) nor (c)?
Explanation opens after your attempt
B. (4)
Concept
(a) is fixed and (b,c) are excluded, so only (d,e) are free. Therefore \(2^2=4\) subsets are possible.
Why this answer is correct
The correct answer is B. (4). (a) is fixed and (b,c) are excluded, so only (d,e) are free. Therefore \(2^2=4\) subsets are possible.
Exam Tip
(a) निश्चित है और (b,c) बाहर हैं, इसलिए केवल (d,e) स्वतंत्र हैं। कुल \(2^2=4\) उपसमुच्चय बनेंगे।
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