यदि \(A=\{1,2,3,4\}\), \(B=\{1,2,3,4\}\) और \(R=\{(a,b):a+b\le5\}\) है, तो (R) में कितने युग्म ऐसे हैं जिनका प्रतिलोम युग्म भी (R) में है?
If \(A=\{1,2,3,4\}\), \(B=\{1,2,3,4\}\), and \(R=\{(a,b):a+b\le5\}\), how many pairs in (R) have their inverse pair also in (R)?
Explanation opens after your attempt
Correct Answer
C. (10)
Concept
The condition \(a+b\le5\) remains the same after reversal, so all (10) pairs of (R) qualify. Recognize symmetric conditions.
Why this answer is correct
The correct answer is C. (10). The condition \(a+b\le5\) remains the same after reversal, so all (10) pairs of (R) qualify. Recognize symmetric conditions.
Exam Tip
शर्त \(a+b\le5\) उलटने पर भी वही रहती है, इसलिए (R) के सभी (10) युग्म योग्य हैं। सममित शर्त को पहचानें।
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