यदि \(A=\{1,2,3,4\}\) है, तो (\mathcal{P}(A)) में कितने subsets ( {1,2}) को subset के रूप में रखते हैं?
If \(A=\{1,2,3,4\}\), how many subsets in (\mathcal{P}(A)) contain ({1,2}) as a subset?
Explanation opens after your attempt
Correct Answer
B. (4)
Concept
A subset containing ({1,2}) has (3) and (4) as optional elements, so \(2^2=4\). In exams, treat the required subset as fixed.
Why this answer is correct
The correct answer is B. (4). A subset containing ({1,2}) has (3) and (4) as optional elements, so \(2^2=4\). In exams, treat the required subset as fixed.
Exam Tip
जिस subset में ({1,2}) शामिल हो, उसमें (3) और (4) वैकल्पिक हैं, इसलिए \(2^2=4\)। परीक्षा में required subset को fixed block मानें।
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