यदि \(A=\{1,2,3,4,5\}\), \(B=\{1,2,3,4,5\}\) और \(R=\{(a,b):a+b\le6\}\) है, तो (R) में ऐसे कितने युग्म हैं जिनमें (a) सम है?
If \(A=\{1,2,3,4,5\}\), \(B=\{1,2,3,4,5\}\), and \(R=\{(a,b):a+b\le6\}\), how many pairs in (R) have (a) even?
Explanation opens after your attempt
B. (6)
Concept
For even (a), (a=2) gives (4) values and (a=4) gives (2). Total is (6) pairs.
Why this answer is correct
The correct answer is B. (6). For even (a), (a=2) gives (4) values and (a=4) gives (2). Total is (6) pairs.
Exam Tip
सम (a) के लिए (a=2) पर (4) और (a=4) पर (2) मान मिलते हैं। कुल (6) युग्म हैं।
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