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If \(f:\{1,2,3,4\}\to\{1,2,3\}\) is defined by \(f=\{(1,1),(2,2),(3,3),(4,3)\}\), which of the following statements is correct?

Answer and explanation

Correct answer: It is a function.

A function must assign exactly one image to every element of its domain. Here, 1, 2, 3 and 4 are assigned the images 1, 2, 3 and 3, respectively, so the relation is a function. Different domain elements may have the same image; therefore, two pre-images of 3 are allowed. Also, a function need not have equally sized domain and codomain, nor must each codomain element have a distinct pre-image. Exam tip: to test a function, check that every input has exactly one output, not that every output has only one input.

Related tags

Relations-FunctionsFunction-DefinitionDomain-CodomainPreimageImageFunctions As A Special Kind Of RelationRelations And FunctionsMathematics

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