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Which option correctly expresses the uniqueness condition of a function?

Answer and explanation

Correct answer: For every x, exactly one f(x) is defined

In a function, every x in the domain must have exactly one corresponding value f(x) in the codomain, so option A is correct. Option B violates uniqueness, while option C leaves a domain element without an image. Option D is not required for a function; it relates to an injective function, where distinct inputs have distinct outputs. Exam tip: check that each input has one and only one output.

Related tags

FunctionsUniquenessRelations And FunctionsDomain And CodomainInjective FunctionsFunctions As A Special Kind Of RelationMathematicsClass 11 Mcq

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