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On (A={1,2,3,4}), how many reflexive relations are not the identity relation but may be the universal relation?

Answer and explanation

Correct answer: (2^{12}-1)

Step 1: On 4 elements, the total number of reflexive relations is (2^{16-4}=2^{12}). Step 2: The identity relation is exactly one of them. Step 3: Only the identity relation is removed, so the count is (2^{12}-1).

Related tags

Identity RelationReflexive CountingUniversal RelationMcqReflexive RelationRelations And FunctionsMathematicsClass 12 Mcq

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