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On A={1,2}, which property is satisfied by R={(1,1),(1,2),(2,1)}?

Answer and explanation

Correct answer: R is symmetric

The correct answer is A: R is symmetric. To test symmetry, reverse each pair. The reverse of (1,1) is itself, and the reverse of (1,2) is (2,1), which is present. Therefore every pair has its reverse. R is not reflexive because a reflexive relation on {1,2} must contain both (1,1) and (2,2), but (2,2) is missing. It is not antisymmetric because for distinct elements 1 and 2, both (1,2) and (2,1) are present. Since an equivalence relation must be reflexive, symmetric, and transitive, the failure of reflexivity already rules out option D. Option B overlooks the missing diagonal pair, and C contradicts the definition of antisymmetry. Memory cue: for a two-element set, check the two diagonals for reflexivity and the two opposite off-diagonal pairs for symmetry or antisymmetry.

Related tags

Symmetric RelationReflexive RelationAntisymmetric RelationEquivalence RelationRelations And FunctionsMathematicsClass 12 Mcq

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