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Which option is closest to the correct definition of a function?

Answer and explanation

Correct answer: A relation in which every x∈A has exactly one y∈B

A function from set A to set B is a special relation in which every element x of the domain A is associated with exactly one element y of B. This means that no element of A may be left without an image and no single element of A may be paired with two different elements of B. Option A states both essential requirements in concise form. Option B allows many outputs for one input and therefore violates the function rule. Option C does not describe the normal assignment from a domain, while option D omits the relation between the sets entirely. The definition does not require different inputs to have different outputs; that additional property would describe a one-one function. Hence A is correct.

Related tags

FunctionsDefinitionDomain-And-CodomainFunctions As A Special Kind Of RelationRelations And FunctionsMathematicsClass 11 Mcq

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