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On (A={1,2,3,4,5,6}), (aRb) if (a+b) is divisible by (3). Why is this not an equivalence relation?

Answer and explanation

Correct answer: Reflexivity fails

Step 1: For reflexivity, (a+a) must be divisible by (3) for every (a). Step 2: (1+1=2), which is not divisible by (3). Step 3: One counterexample is enough to break reflexivity.

Related tags

ReflexivityCounterexampleDivisibilityEquivalence RelationRelations And FunctionsMathematicsClass 12 Mcq

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