यदि \(A=\{1,2,3,4,5\}\) और \(B=\{1,3,5,7\}\), तो \(A\times B\) में \(a\le b\) वाले युग्मों की संख्या कितनी है?
If \(A=\{1,2,3,4,5\}\) and \(B=\{1,3,5,7\}\), how many pairs in \(A\times B\) satisfy \(a\le b\)?
Explanation opens after your attempt
D. (14)
Concept
For (a=1,2,3,4,5), the numbers of choices are (4,3,3,2,2). Total is (14), so count (b) for each (a).
Why this answer is correct
The correct answer is D. (14). For (a=1,2,3,4,5), the numbers of choices are (4,3,3,2,2). Total is (14), so count (b) for each (a).
Exam Tip
(a=1,2,3,4,5) पर क्रमशः (4,3,3,2,2) विकल्प मिलते हैं। कुल (14) है, इसलिए हर (a) के लिए (b) गिनें।
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