यदि \(A=\{0,1,2,3,4\}\) और \(B=\{0,1,2,3,4\}\) हैं, तो \(A\times B\) में कितने युग्म ((a,b)) ऐसे हैं जिनमें \(a+b\le4\) और \(a\ne b\) है?
If \(A=\{0,1,2,3,4\}\) and \(B=\{0,1,2,3,4\}\), how many pairs ((a,b)) in \(A\times B\) satisfy \(a+b\le4\) and \(a\ne b\)?
Explanation opens after your attempt
D. (12)
Concept
There are (15) pairs with \(a+b\le4\), and equal pairs among them are ((0,0),(1,1),(2,2)). Hence (15-3=12).
Why this answer is correct
The correct answer is D. (12). There are (15) pairs with \(a+b\le4\), and equal pairs among them are ((0,0),(1,1),(2,2)). Hence (15-3=12).
Exam Tip
\(a+b\le4\) वाले कुल (15) युग्म हैं और उनमें बराबर युग्म ((0,0),(1,1),(2,2)) हैं। इसलिए (15-3=12)।
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