यदि \(A=\{p,q,r,s\}\) है तो ऐसे उपसमुच्चयों की संख्या कितनी है जिनमें (p) या (q) में से कम से कम एक हो?
If \(A=\{p,q,r,s\}\) then how many subsets contain at least one of (p) or (q)?
Explanation opens after your attempt
C. (12)
Concept
Total subsets are (16), and those containing neither (p) nor (q) are \(2^2=4\). Hence the answer is (16-4=12).
Why this answer is correct
The correct answer is C. (12). Total subsets are (16), and those containing neither (p) nor (q) are \(2^2=4\). Hence the answer is (16-4=12).
Exam Tip
कुल उपसमुच्चय (16) हैं और जिनमें (p,q) दोनों नहीं हैं वे \(2^2=4\) हैं। अतः उत्तर (16-4=12) है।
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