यदि \(A=\{1,3,9\}\) है तो (\mathcal{P}(A)) में कितने उपसमुच्चय ({1,9}) को शामिल करेंगे?
If \(A=\{1,3,9\}\), how many subsets in (\mathcal{P}(A)) will include ({1,9})?
Explanation opens after your attempt
B. (2)
Concept
Keeping (1) and (9) is fixed and (3) can be taken or not taken in (2) ways. So there are (2) such subsets.
Why this answer is correct
The correct answer is B. (2). Keeping (1) and (9) is fixed and (3) can be taken or not taken in (2) ways. So there are (2) such subsets.
Exam Tip
(1) और (9) रखना तय है और (3) को लेने या न लेने के (2) तरीके हैं। इसलिए ऐसे (2) उपसमुच्चय हैं।
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