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Question
Which sets of ordered pairs represent functions from A = {1, 2, 3, 4} to B = {−1, 0, 1, 2, 3}? Justify.
{(1, 2), (2, −1), (3, 1), (4, 3)}
Solution
Let f = {(1, 2), (2, −1), (3, 1), (4, 3)}
f is a function because every element of A is related to one and only one element of B.
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