यदि \(A=\{1,2,3,4\}\) है, तो (\mathcal{P}(A)) में ऐसे कितने तत्व हैं जिनमें (1) हो लेकिन (4) न हो?
If \(A=\{1,2,3,4\}\), how many elements of (\mathcal{P}(A)) contain (1) but not (4)?
Explanation opens after your attempt
B. (4)
Concept
Keeping (1) and excluding (4) are fixed. For the remaining (2,3), there are \(2^2=4\) choices.
Why this answer is correct
The correct answer is B. (4). Keeping (1) and excluding (4) are fixed. For the remaining (2,3), there are \(2^2=4\) choices.
Exam Tip
(1) को रखना और (4) को हटाना निश्चित है। बचे (2,3) के लिए \(2^2=4\) विकल्प हैं।
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