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If A={0,1,2}, which is the identity function on A?

Answer and explanation

Correct answer: {(0,0),(1,1),(2,2)}

The governing concept is the identity function. For a set A, the identity function I_A maps every element to itself, so I_A(x)=x for every x in A. Since A={0,1,2}, the required ordered pairs are (0,0), (1,1), and (2,2). This is exactly option A. Option B cycles the elements, so the outputs differ from the inputs. Option C maps both 1 and 2 to 0, making it a constant-like mapping rather than an identity mapping. Option D interchanges 0 and 2 while leaving 1 fixed. Although the alternatives may describe relations or valid functions, none sends every element to itself. Therefore only option A represents the identity function on A.

Related tags

FunctionsIdentity-FunctionFinite-SetMathematicsClass 11Functions As A Special Kind Of RelationRelations And FunctionsClass 11 Mcq

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