यदि \(A=\{1,2,3,4,5\}\) है, तो (\mathcal{P}(A)) में ऐसे subsets कितने हैं जो ({1,2}) को contain करते हैं और (5) को नहीं रखते?
If \(A=\{1,2,3,4,5\}\), how many subsets in (\mathcal{P}(A)) contain ({1,2}) and do not contain (5)?
Explanation opens after your attempt
Correct Answer
B. (4)
Concept
({1,2}) is fixed and (5) is excluded, so (3,4) are optional. The number is \(2^2=4\).
Why this answer is correct
The correct answer is B. (4). ({1,2}) is fixed and (5) is excluded, so (3,4) are optional. The number is \(2^2=4\).
Exam Tip
({1,2}) fixed है और (5) excluded है, इसलिए (3,4) optional हैं। संख्या \(2^2=4\) है।
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