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Given f:{1,2,3}→{1,2,3,4,5} with f(x)=2x, why is this function not well-defined?

Answer and explanation

Correct answer: Because f(3)=6 is not in {1,2,3,4,5}

A function from a domain to a codomain must assign exactly one value in the codomain to every element of its domain. Therefore, the rule used to define the function must produce an allowed codomain value for each input. Here the domain is {1,2,3}, the codomain is {1,2,3,4,5}, and f(x)=2x. We obtain f(1)=2 and f(2)=4, both of which belong to the codomain. However, f(3)=2×3=6, and 6 is not an element of {1,2,3,4,5}. Thus the proposed mapping does not remain inside its stated codomain and is not well-defined as written. Option A identifies this exact failure. The fact that the outputs are even, or that the domain has three elements, is not itself a problem.

Related tags

Well-Defined FunctionCodomainFunctionsRelations And FunctionsMathematicsFunctions As A Special Kind Of RelationClass 11 Mcq

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