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On A = {1,2,3,4}, let R = {(a,b) : a + b = 5}. What type of relation is R?

Answer and explanation

Correct answer: Symmetric but not reflexive

The condition defining R is a+b=5. If (a,b) satisfies it, then reversing the components gives b+a=5 because addition is commutative; hence (b,a) also belongs to R, so R is symmetric. Reflexivity would require (a,a) for every a in A. But for a=1, 1+1≠5, and similarly the diagonal pairs are absent. Therefore R is symmetric but not reflexive.

Related tags

Sum RelationSymmetric RelationReflexive Relation

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