यदि \(A=\{1,2,3,4\}\) और \(B=\{1,2,3,4\}\) हैं, तो \(A\times B\) में कितने युग्म ((a,b)) ऐसे हैं जिनमें (\gcd(a,b)=2) है?
If \(A=\{1,2,3,4\}\) and \(B=\{1,2,3,4\}\), how many pairs ((a,b)) in \(A\times B\) satisfy (\gcd(a,b)=2)?
Explanation opens after your attempt
B. (3)
Concept
The pairs are ((2,2),(2,4),(4,2)), so the number is (3). In \(\gcd\) questions, check common factors.
Why this answer is correct
The correct answer is B. (3). The pairs are ((2,2),(2,4),(4,2)), so the number is (3). In \(\gcd\) questions, check common factors.
Exam Tip
ऐसे युग्म ((2,2),(2,4),(4,2)) हैं, इसलिए संख्या (3) है। \(\gcd\) वाले प्रश्न में सामान्य गुणनखंड जाँचें।
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