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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 idea is symmetric closure. The inverse relation R⁻¹ contains the reverse pair for every pair in R. Let S = R ∪ R⁻¹. If (a,b) belongs to S, then either (a,b) belongs to R or it belongs to R⁻¹. In the first case, (b,a) belongs to R⁻¹; in the second case, (b,a) belongs to R. Thus in both cases the reverse pair belongs to S, proving that S is symmetric. The union need not be reflexive because R may contain no self-pairs, and it need not be empty. Since the union of two relations on the same sets is itself a relation, option D is also false. Hence A is always true.

Related tags

Symmetric ClosureInverse RelationUnionSymmetric RelationRelations And FunctionsMathematicsClass 12 Mcq

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