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If in a mapping diagram arrows from (a) go to both (1) and (2), why is it not a function?

Answer and explanation

Correct answer: Because (a) has two images

The direct answer is A: a has two images. A function must assign exactly one output to every input in its domain. If the mapping diagram shows arrows from the single domain element a to both 1 and 2, then the same input has two different images. This violates the definition of a function, even if every arrow ends in the codomain. Option A is correct because the failure is caused by two outputs for one input. Option B is wrong: being in the codomain is allowed and is not a reason for failure. Option C is wrong because belonging to the domain is required, not forbidden. Option D is wrong because arrows do exist; in fact, there are two arrows. If an input has no arrow, that also fails the function rule, but that is not what this diagram shows. Memory cue: one input, exactly one arrow; many inputs may point to one output, but one input cannot point to two different outputs.

Related tags

FunctionsMapping-DiagramNot-Function

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