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If (A) has (n) elements, which formula gives the number of reflexive relations on (A)?

Answer and explanation

Correct answer: (2^{n^2-n})

Step 1: (A\times A) has (n^2) pairs. Step 2: A reflexive relation must contain the (n) diagonal pairs. Step 3: The remaining (n^2-n) pairs are optional, so the count is (2^{n^2-n}).

Related tags

RelationsReflexiveGeneral-FormulaCountingIntroduction To RelationsRelations And FunctionsMathematicsClass 12 Mcq

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