यदि \(A=\{1,2,3,4,5\}\) और \(B=\{2,3,4,5,6\}\) हैं, तो \(A\times B\) में कितने युग्म ((a,b)) ऐसे हैं जिनमें (ab) विषम है?
If \(A=\{1,2,3,4,5\}\) and \(B=\{2,3,4,5,6\}\), how many pairs ((a,b)) in \(A\times B\) have (ab) odd?
Explanation opens after your attempt
Correct Answer
C. (6)
Concept
The product is odd only when both components are odd. (A) has (3) odd elements and (B) has (2), so \(3\cdot2=6\).
Why this answer is correct
The correct answer is C. (6). The product is odd only when both components are odd. (A) has (3) odd elements and (B) has (2), so \(3\cdot2=6\).
Exam Tip
गुणनफल विषम तभी होगा जब दोनों अवयव विषम हों। (A) में (3) और (B) में (2) विषम अवयव हैं, इसलिए \(3\cdot2=6\)।
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