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If A = {1, 2, 3}, which of the following is the identity function I_A?

Answer and explanation

Correct answer: {(1, 1), (2, 2), (3, 3)}

In an identity function, every element of A maps to itself, so f(x) = x. Hence all ordered pairs must be of the form (x, x), giving {(1, 1), (2, 2), (3, 3)}. In option B the elements map cyclically, while options C and D do not map every element to itself. Exam tip: for an identity function, check that the two entries in every ordered pair are equal.

Related tags

Relations And FunctionsIdentity FunctionOrdered PairsMappingFunctions As A Special Kind Of RelationMathematicsClass 11 Mcq

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