यदि \(A=\{1,2,3,4\}\) और \(B=\{5,6,7\}\) हैं, तो \(A\times B\) के कितने उपसमुच्चय ((1,5)) और ((4,7)) को रखते हैं पर ((2,6)) को नहीं रखते हैं?
If \(A=\{1,2,3,4\}\) and \(B=\{5,6,7\}\), how many subsets of \(A\times B\) contain ((1,5)) and ((4,7)) but do not contain ((2,6))?
Explanation opens after your attempt
B. (512)
Concept
There are (12) pairs, and after forcing (2) in and (1) out, (9) pairs remain free. Hence the number is \(2^9=512\).
Why this answer is correct
The correct answer is B. (512). There are (12) pairs, and after forcing (2) in and (1) out, (9) pairs remain free. Hence the number is \(2^9=512\).
Exam Tip
कुल (12) युग्म हैं, (2) युग्म रखने और (1) युग्म हटाने के बाद (9) स्वतंत्र युग्म बचते हैं। इसलिए संख्या \(2^9=512\) है।
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