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On A = {1,2,3,4}, let R = {(a,b) : a + b ≤ 5}. Is R symmetric?

Answer and explanation

Correct answer: Yes, it is symmetric

To test symmetry, assume (a,b) ∈ R. By definition, a+b≤5. Since addition is commutative, b+a has exactly the same value as a+b, so b+a≤5 as well. Therefore (b,a) ∈ R whenever (a,b) ∈ R, which proves that R is symmetric. The relation is not empty—for example, (1,1) belongs to it—and the question does not require testing reflexivity.

Related tags

Inequality RelationSymmetric RelationCommutative Addition

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