यदि \(A=\{1,2,3,4\}\) और \(B=\{2,3,5,7,11\}\) हैं, तो \(A\times B\) में कितने युग्म ((a,b)) ऐसे हैं जिनमें (b-a) अभाज्य है?
If \(A=\{1,2,3,4\}\) and \(B=\{2,3,5,7,11\}\), how many pairs ((a,b)) in \(A\times B\) have (b-a) prime?
Explanation opens after your attempt
Correct Answer
B. (6)
Concept
Checking possible differences gives (6) pairs with prime difference. Remember that (1) is not prime.
Why this answer is correct
The correct answer is B. (6). Checking possible differences gives (6) pairs with prime difference. Remember that (1) is not prime.
Exam Tip
संभव अंतरों को जाँचने पर अभाज्य अंतर वाले (6) युग्म मिलते हैं। ध्यान रखें कि (1) अभाज्य नहीं है।
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