यदि \(A=\{1,2,3,4,5,6,7\}\) है, तो (A) के ऐसे उपसमुच्चयों की संख्या कितनी है जिनमें (3) और (7) दोनों हों?
If \(A=\{1,2,3,4,5,6,7\}\), how many subsets of (A) contain both (3) and (7)?
Explanation opens after your attempt
B. (32)
Concept
Including (3) and (7) is fixed and the remaining (5) elements are free. So the number is \(2^5=32\).
Why this answer is correct
The correct answer is B. (32). Including (3) and (7) is fixed and the remaining (5) elements are free. So the number is \(2^5=32\).
Exam Tip
(3) और (7) को रखना तय है और बाकी (5) तत्व स्वतंत्र हैं। इसलिए संख्या \(2^5=32\) होगी।
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