यदि \(A=\{1,2\}\) और \(B=\{1,2,3\}\) हैं, तो \(A\times B\) में पहले घटक के दूसरे घटक के बराबर होने वाले कितने युग्म हैं?
If \(A=\{1,2\}\) and \(B=\{1,2,3\}\), how many pairs in \(A\times B\) have first component equal to second component?
Explanation opens after your attempt
Correct Answer
B. (2)
Concept
The equal-component pairs are ((1,1)) and ((2,2)). In such questions, common elements of both sets are useful.
Why this answer is correct
The correct answer is B. (2). The equal-component pairs are ((1,1)) and ((2,2)). In such questions, common elements of both sets are useful.
Exam Tip
समान घटक वाले युग्म ((1,1)) और ((2,2)) हैं। ऐसे प्रश्न में दोनों समुच्चयों के साझा तत्व काम आते हैं।
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