# Which of the following best defines a function? A] A function is a special type of relation for which there is a rule that pairs each input with exactly one output. B]A function is a relationship that defines the connection between two variables.C] A function is a set of ordered pairs in which no y-value repeats. D]A function pairs input and output values with no particular pattern.

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Answer: A. A function is a special type of relation for which there is a rule that pairs each input with exactly one output.Option B is incorrect because it does not include that there cannot be two x-values with the same y-value. Option C is incorrect because it is a relation, not just a set of ordered pairs. Option D is incorrect because there is a particular pattern in a function.

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