यदि \(A=\{2,3,5,7\}\) है, तो कितने उपसमुच्चय (2) और (7) दोनों को शामिल करते हैं?
If \(A=\{2,3,5,7\}\), how many subsets contain both (2) and (7)?
Explanation opens after your attempt
Correct Answer
B. (4)
Concept
Elements (2,7) are fixed, while (3,5) are optional. So there are \(2^2=4\) subsets.
Why this answer is correct
The correct answer is B. (4). Elements (2,7) are fixed, while (3,5) are optional. So there are \(2^2=4\) subsets.
Exam Tip
(2,7) निश्चित हैं और (3,5) वैकल्पिक हैं। इसलिए \(2^2=4\) उपसमुच्चय हैं।
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