यदि \(A=\{1,2,3,4\}\) और \(B=\{1,2,4,8\}\) हैं, तो \(A\times B\) में कितने युग्म ((a,b)) ऐसे हैं जिनमें (b=2a) है?
If \(A=\{1,2,3,4\}\) and \(B=\{1,2,4,8\}\), how many pairs ((a,b)) in \(A\times B\) satisfy (b=2a)?
Explanation opens after your attempt
Correct Answer
B. (2)
Concept
The condition gives ((1,2)) and ((2,4)); for (a=3,4), (b) is not in (B). Hence there are (2) pairs.
Why this answer is correct
The correct answer is B. (2). The condition gives ((1,2)) and ((2,4)); for (a=3,4), (b) is not in (B). Hence there are (2) pairs.
Exam Tip
शर्त से ((1,2)) और ((2,4)) मिलते हैं; (a=3,4) पर (b) (B) में नहीं है। इसलिए (2) युग्म हैं।
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