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Which statement gives the correct definition of a symmetric relation?

Answer and explanation

Correct answer: For all a,b ∈ A, if (a,b) ∈ R, then (b,a) ∈ R

A relation R on a set A is symmetric exactly when every ordered pair in R is accompanied by its reverse ordered pair. In formal notation, for all a,b in A, (a,b) in R implies (b,a) in R. Option A states this condition without adding any unnecessary restriction. Option B is the definition of a reflexive relation, which requires all self-pairs. Option C describes transitivity, where two linked pairs force a third pair. Option D describes a relation contained in the identity relation; it does not define symmetry and is stronger than necessary. Therefore the first statement is the only correct definition.

Related tags

DefinitionSymmetric RelationReflexive RelationTransitive RelationRelations And FunctionsMathematicsClass 12 Mcq

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