यदि \(A=\{1,2,3\}\) और \(B=\{1,2,3,4\}\), तो \(A\times B\) में (a<b) वाले युग्मों की संख्या कितनी है?
If \(A=\{1,2,3\}\) and \(B=\{1,2,3,4\}\), how many pairs in \(A\times B\) satisfy (a<b)?
Explanation opens after your attempt
C. (6)
Concept
For (a=1) there are (3), for (a=2) there are (2), and for (a=3) there is (1) choice. Total is (6), and the order in inequality matters.
Why this answer is correct
The correct answer is C. (6). For (a=1) there are (3), for (a=2) there are (2), and for (a=3) there is (1) choice. Total is (6), and the order in inequality matters.
Exam Tip
(a=1) पर (3), (a=2) पर (2), और (a=3) पर (1) विकल्प मिलते हैं। कुल (6) है और असमता में क्रम ध्यान से देखें।
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