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Answered

Is this relation a function?

{(1, 3), (2, 3), (3, 4), (4, 5)}


No, because at least one output maps to more than one input.
No, because at least one output maps to more than one input.

Yes, because every input has exactly one output.
Yes, because every input has exactly one output.

No, because at least one input maps to more than one output.
No, because at least one input maps to more than one output.

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