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If a set (A) has 4 elements, what is the number of reflexive relations on (A)?

Answer and explanation

Correct answer: (2^{12})

Step 1: For 4 elements, (A \times A) has 16 pairs. Step 2: Reflexivity fixes 4 diagonal pairs, so (16-4=12) pairs are optional. Step 3: Each optional pair has two choices, giving (2^{12}).

Related tags

Number Of RelationsReflexive RelationCartesian ProductSchool ExamRelations And FunctionsMathematicsClass 12 Mcq

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