यदि \(A=\{1,2,3,4,5,6\}\) और \(B=\{1,2,3,4,5,6\}\) हैं, तो \(A\times B\) में कितने युग्म ((a,b)) ऐसे हैं जिनमें \(a\mid b\) और (a<b) दोनों हैं?
If \(A=\{1,2,3,4,5,6\}\) and \(B=\{1,2,3,4,5,6\}\), how many pairs ((a,b)) in \(A\times B\) satisfy both \(a\mid b\) and (a<b)?
Explanation opens after your attempt
B. (8)
Concept
For (a=1), there are (5) pairs; for (a=2), (2); and for (a=3), (1), totaling (8). Do not include (a=b).
Why this answer is correct
The correct answer is B. (8). For (a=1), there are (5) pairs; for (a=2), (2); and for (a=3), (1), totaling (8). Do not include (a=b).
Exam Tip
(a=1) पर (5), (a=2) पर (2), और (a=3) पर (1) युग्म मिलते हैं, कुल (8)। समानता (a=b) को शामिल न करें।
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