यदि \(A=\{1,2,3,4\}\) और \(B=\{1,2,3,4\}\), तो \(A\times B\) में कितने युग्म ((a,b)) ऐसे हैं जिनमें (a+b) सम है?
If \(A=\{1,2,3,4\}\) and \(B=\{1,2,3,4\}\), how many pairs ((a,b)) in \(A\times B\) have (a+b) even?
Explanation opens after your attempt
B. (8)
Concept
The sum is even when both components have the same parity. The count is \(2\cdot2+2\cdot2=8\).
Why this answer is correct
The correct answer is B. (8). The sum is even when both components have the same parity. The count is \(2\cdot2+2\cdot2=8\).
Exam Tip
योग सम तब है जब दोनों अवयवों की समता समान हो। \(2\cdot2+2\cdot2=8\) युग्म मिलते हैं।
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