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

Answer and explanation

Correct answer: R⁻¹ = R

The inverse relation R⁻¹ is formed by reversing every ordered pair: (a, b) ∈ R⁻¹ exactly when (b, a) ∈ R. If R is symmetric, the presence of (b, a) in R guarantees the presence of (a, b) in R, so reversing all pairs produces no new relation; every pair of R⁻¹ is already in R. The same reasoning in reverse gives R ⊆ R⁻¹, hence R⁻¹ = R. Symmetry does not imply emptiness, so options B and C are false, while D states the opposite. Therefore A is correct.

Related tags

Symmetric RelationInverse RelationOrdered Pairs

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