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Which option represents the identity function on the set A = {2, 3, 4}?

Answer and explanation

Correct answer: {(2,2), (3,3), (4,4)}

In an identity function, every element of the set maps to itself, so each ordered pair has the form (x, x). Hence, {(2,2), (3,3), (4,4)} is correct. Option B gives a cyclic mapping, option C is a constant function, and option D interchanges 2 and 4. Exam tip: In an identity function, the input and output are equal for every element.

Related tags

RelationsFunctionsIdentity-FunctionFinite-SetsOrdered-PairsFunctions As A Special Kind Of RelationRelations And FunctionsMathematics

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