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On (A={1,2,3,4}), (aRb) holds when (a=b) or (a+b=5). Is this an equivalence relation?

Answer and explanation

Correct answer: Yes, classes are ({1,4},{2,3})

Step 1: The condition (a=b) ensures reflexivity. Step 2: The condition (a+b=5) is symmetric. Step 3: The pairs form the classes ({1,4}) and ({2,3}), so the relation is an equivalence relation.

Related tags

Finite SetSum ConditionEquivalence ClassesEquivalence RelationRelations And FunctionsMathematicsClass 12 Mcq

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