यदि \(A=\{1,2,3\}\) है तो (\mathcal{P}(A)) में कुल कितने समुच्चय (1) को रखते हैं?
If \(A=\{1,2,3\}\), how many sets in (\mathcal{P}(A)) contain (1)?
Explanation opens after your attempt
C. (4)
Concept
Keep (1) fixed and choose or not choose the remaining (2) elements in \(2^2=4\) ways. So there are (4) such subsets.
Why this answer is correct
The correct answer is C. (4). Keep (1) fixed and choose or not choose the remaining (2) elements in \(2^2=4\) ways. So there are (4) such subsets.
Exam Tip
(1) को स्थिर रखकर बाकी (2) तत्वों को चुनने या न चुनने के \(2^2=4\) तरीके हैं। इसलिए ऐसे (4) उपसमुच्चय हैं।
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