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If R is a symmetric relation, which statement about R ∪ R⁻¹ is correct?

Answer and explanation

Correct answer: It is equal to R

For any relation, R⁻¹ is obtained by reversing ordered pairs. Since R is symmetric, reversing its pairs produces no new pairs and gives R⁻¹ = R. Substituting this into the expression yields R ∪ R⁻¹ = R ∪ R. The union of a set with itself is the set itself, so the expression equals R. It is not necessarily empty or universal.

Related tags

Inverse RelationUnionSymmetric Relation

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