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Maths-

General

Easy

Question

If $R equals left curly bracket open parentheses a comma b close parentheses colon a plus b equals 4 right curly bracket$ is a relation on $N comma$ then $R$ is

Reflexive
Symmetric
Antisymmetric
Transitive

The correct answer is: Symmetric

Clearly, $R equals left curly bracket open parentheses 13 close parentheses comma open parentheses 31 close parentheses comma left parenthesis 22 right parenthesis right curly bracket$
We observe that $R$ is symmetric only

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