\((A={1,2,3,4}) पर (R={(a,b):a+b\) is odd}) कैसा है?
\(On (A={1,2,3,4}), what is (R={(a,b):a+b\) is odd})?
Explanation opens after your attempt
Correct Answer
A. सममित पर स्वसम नहींSymmetric but not reflexive
Concept
If (a+b) is odd, then (b+a) is also odd. But (a+a) is always even, so it is not reflexive.
Why this answer is correct
The correct answer is A. सममित पर स्वसम नहीं / Symmetric but not reflexive. If (a+b) is odd, then (b+a) is also odd. But (a+a) is always even, so it is not reflexive.
Exam Tip
(a+b) विषम हो तो (b+a) भी विषम है। पर (a+a) सदैव सम होता है इसलिए स्वसम नहीं।
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