यदि \(A=\{1,2,3,4,5\}\), \(B=\{1,2,3,4,5\}\) और \(T=\{(a,b):|a-b|\le2\}\) है, तो (|T|) क्या है?
If \(A=\{1,2,3,4,5\}\), \(B=\{1,2,3,4,5\}\), and \(T=\{(a,b):|a-b|\le2\}\), what is (|T|)?
Explanation opens after your attempt
Correct Answer
B. (19)
Concept
Among (25) total pairs, (6) pairs have (|a-b|>2), so (25-6=19). Complement counting is quicker.
Why this answer is correct
The correct answer is B. (19). Among (25) total pairs, (6) pairs have (|a-b|>2), so (25-6=19). Complement counting is quicker.
Exam Tip
कुल (25) युग्मों में (|a-b|>2) वाले (6) युग्म हैं, इसलिए (25-6=19)। पूरक गिनती तेज रहती है।
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