यदि \(A=\{1,2,3,4\}\) और \(B=\{1,2,3\}\) हैं, तो \(A\times B\) में कितने युग्म ((a,b)) ऐसे हैं जिनमें (a+b) अभाज्य है?
If \(A=\{1,2,3,4\}\) and \(B=\{1,2,3\}\), how many pairs ((a,b)) in \(A\times B\) have (a+b) prime?
Explanation opens after your attempt
Correct Answer
C. (7)
Concept
Checking all sums gives (7) pairs with prime sum. In such questions, look for prime sums like (2,3,5,7).
Why this answer is correct
The correct answer is C. (7). Checking all sums gives (7) pairs with prime sum. In such questions, look for prime sums like (2,3,5,7).
Exam Tip
सभी योग जाँचने पर अभाज्य योग वाले (7) युग्म मिलते हैं। ऐसे प्रश्नों में (2,3,5,7) जैसे अभाज्य योग देखें।
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