यदि \(A=\{1,2,3,4,5\}\) और \(B=\{2,3,4,5,6,7\}\) हैं, तो \(A\times B\) में कितने युग्म ((a,b)) ऐसे हैं जिनमें (a+b) अभाज्य और (a<b) है?
If \(A=\{1,2,3,4,5\}\) and \(B=\{2,3,4,5,6,7\}\), how many pairs ((a,b)) in \(A\times B\) have (a+b) prime and (a<b)?
Explanation opens after your attempt
B. (8)
Concept
Applying both conditions gives (8) pairs. First filter by (a<b), then test prime sums.
Why this answer is correct
The correct answer is B. (8). Applying both conditions gives (8) pairs. First filter by (a<b), then test prime sums.
Exam Tip
दोनों शर्तें लगाने पर (8) युग्म मिलते हैं। पहले (a<b) से छाँटें और फिर अभाज्य योग जाँचें।
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