यदि \(A=\{10,20,30\}\) है तो (\mathcal{P}(A)) में कौन सा अवश्य होगा?
If \(A=\{10,20,30\}\), which one must be in (\mathcal{P}(A))?
Explanation opens after your attempt
B. ({20})
Concept
({20}) is a subset of (A), so it will be in (\mathcal{P}(A)). Do not treat direct (20) as an element of the power set.
Why this answer is correct
The correct answer is B. ({20}). ({20}) is a subset of (A), so it will be in (\mathcal{P}(A)). Do not treat direct (20) as an element of the power set.
Exam Tip
({20}) (A) का एक उपसमुच्चय है इसलिए यह (\mathcal{P}(A)) में होगा। सीधे (20) को घात समुच्चय का तत्व न समझें।
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