Mathematics, 14.11.2019 11:31, gray69

Which statement describes how to determine if a relation given in a table is a function?

if none of the output values are repeated, the relation is a function.
if none of the input values are repeated, the relation is a function.
if any of the input values are equal to the output values, the relation is a function.
if all the output values are paired with the same input value, the relation is a function.

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Which statement describes how to determine if a relation given in a table is a function?