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Which is a function and which is not

Which is a function and which is not-example-1
User Jaaaaaaay
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Answer:

[1] Function

[2] Not a function

[3] Function

[4] Function

Explanation:

For a relation to have a function, each input must have only one output. However, an output can have multiple inputs. Based upon this information, all relations besides Relation 2 (because b has two outputs) are functions.

Which is a function and which is not-example-1
User ZKSteffel
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