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On (A={1,2,3}), how many relations are both symmetric and antisymmetric but not reflexive?

Answer and explanation

Correct answer: (2^3-1)

Step 1: Being both symmetric and antisymmetric allows only diagonal pairs. Step 2: With (3) diagonal pairs, there are (2^3) such relations. Step 3: One of them is the full identity relation, which is reflexive; removing it gives (2^3-1).

Related tags

RelationsSymmetric-Antisymmetric-Not-ReflexiveCountingIntroduction To RelationsRelations And FunctionsMathematicsClass 12 Mcq

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