यदि \(A=\{1,2,3,4,5\}\) और \(B=\{1,2,3,4,5,6\}\) हैं, तो \(A\times B\) में कितने युग्म ((a,b)) ऐसे हैं जिनमें \(ab\le10\) है?
If \(A=\{1,2,3,4,5\}\) and \(B=\{1,2,3,4,5,6\}\), how many pairs ((a,b)) in \(A\times B\) satisfy \(ab\le10\)?
Explanation opens after your attempt
B. (19)
Concept
For (a=1,2,3,4,5), the counts of (b) are (6,5,3,2,2), totaling (18). In product conditions, the boundary changes.
Why this answer is correct
The correct answer is B. (19). For (a=1,2,3,4,5), the counts of (b) are (6,5,3,2,2), totaling (18). In product conditions, the boundary changes.
Exam Tip
(a=1,2,3,4,5) के लिए (b) के (6,5,3,2,2) मान मिलते हैं, कुल (18)। गुणन शर्त में सीमा बदलती है।
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