यदि \(A=\{1,2,3\}\) और \(B=\{1,2\}\), तो \(A\times B\) में ऐसे कितने युग्म हैं जिनमें (a-b) धनात्मक है?
If \(A=\{1,2,3\}\) and \(B=\{1,2\}\), how many pairs in \(A\times B\) have (a-b) positive?
Explanation opens after your attempt
Correct Answer
B. (3)
Concept
We need (a>b); the pairs are ((2,1),(3,1),(3,2)). For a positive difference, the first coordinate must be larger.
Why this answer is correct
The correct answer is B. (3). We need (a>b); the pairs are ((2,1),(3,1),(3,2)). For a positive difference, the first coordinate must be larger.
Exam Tip
(a>b) चाहिए; युग्म ((2,1),(3,1),(3,2)) हैं। धनात्मक अंतर के लिए पहले घटक को बड़ा होना चाहिए।
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