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For any relation R, which statement about R ∪ R⁻¹ is always true?

Answer and explanation

Correct answer: It is symmetric

The governing concept is symmetry: a relation S is symmetric when (a,b) ∈ S implies (b,a) ∈ S. If (a,b) belongs to R, then (b,a) belongs to R⁻¹; if (a,b) belongs to R⁻¹, then (b,a) belongs to R. Thus every pair in R ∪ R⁻¹ brings its reverse pair into the same union. Therefore option A is always true. Reflexivity and transitivity are not guaranteed, and the union need not be empty.

Related tags

Symmetric RelationInverse RelationSymmetric Closure

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