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On (A={1,2,3,4}), (R={(1,1),(2,2),(3,3),(4,4),(1,2),(2,1),(1,3),(3,1)}) is given. Why is it not an equivalence relation?

Answer and explanation

Correct answer: Because ((2,3)) is missing although ((2,1)) and ((1,3)) are present

Step 1: All ((a,a)) pairs are present, so reflexivity holds. Step 2: Symmetry is also visible from the given pairs. Step 3: But from ((2,1)) and ((1,3)), transitivity requires ((2,3)), which is missing; hence it is not an equivalence relation.

Related tags

Transitivity FailureOrdered PairsEquivalence RelationExpert McqRelations And FunctionsMathematicsClass 12 Mcq

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