यदि \(A=\{1,2,3,4,5\}\) और \(B=\{1,2,3,4\}\) हैं, तो \(A\times B\) में कितने युग्म ((a,b)) ऐसे हैं जिनमें (a+b) (4) से विभाज्य है?
If \(A=\{1,2,3,4,5\}\) and \(B=\{1,2,3,4\}\), how many pairs ((a,b)) in \(A\times B\) have (a+b) divisible by (4)?
Explanation opens after your attempt
Correct Answer
B. (5)
Concept
The pairs with sum divisible by (4) are ((1,3),(2,2),(3,1),(4,4),(5,3)). In such questions, count using remainders.
Why this answer is correct
The correct answer is B. (5). The pairs with sum divisible by (4) are ((1,3),(2,2),(3,1),(4,4),(5,3)). In such questions, count using remainders.
Exam Tip
योग (4) से विभाज्य होने वाले युग्म ((1,3),(2,2),(3,1),(4,4),(5,3)) हैं। ऐसे प्रश्नों में शेषफल के आधार पर गिनती करें।
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