यदि \(A=\{1,2,3,4,5\}\) और \(R=\{(a,b):a=2b\}\), तो (R) में कितने युग्म होंगे?
If \(A=\{1,2,3,4,5\}\) and \(R=\{(a,b):a=2b\}\), how many pairs are in (R)?
Explanation opens after your attempt
B. (2)
Concept
For (b=1), (a=2), and for (b=2), (a=4). Thus the pairs are ((2,1),(4,2)), so the count is (2).
Why this answer is correct
The correct answer is B. (2). For (b=1), (a=2), and for (b=2), (a=4). Thus the pairs are ((2,1),(4,2)), so the count is (2).
Exam Tip
(b=1) पर (a=2) और (b=2) पर (a=4) मिलता है। इसलिए युग्म ((2,1),(4,2)) हैं और संख्या (2) है।
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