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If set A has 4 elements, how many reflexive relations are possible on A?

Answer and explanation

Correct answer: 2^12

For a set with n elements, a relation is a subset of the n² ordered pairs. Reflexivity requires all n diagonal pairs (a,a), while the remaining n² − n pairs may be chosen or omitted independently. For n = 4, there are 16 total pairs and 4 compulsory pairs, leaving 12 optional pairs. Therefore the number is 2^12, so option A is correct.

Related tags

Reflexive RelationsCountingOrdered PairsRelations And Functions

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