यदि \(A=\{1,2,3,4\}\) और \(B=\{2,3,5,7\}\), तो \(A\times B\) में कितने युग्म ((a,b)) ऐसे हैं जिनमें (a+b) अभाज्य है?
If \(A=\{1,2,3,4\}\) and \(B=\{2,3,5,7\}\), how many pairs ((a,b)) in \(A\times B\) have (a+b) prime?
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Correct Answer
B. (6)
Concept
Checking systematically gives (6) pairs with prime sum. In such questions, test all possible sums in an organized way.
Why this answer is correct
The correct answer is B. (6). Checking systematically gives (6) pairs with prime sum. In such questions, test all possible sums in an organized way.
Exam Tip
जाँचने पर अभाज्य योग वाले (6) युग्म मिलते हैं। ऐसे प्रश्नों में सभी संभावित योगों को व्यवस्थित रूप से जाँचें।
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