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Question
Let X = {1, 2, 3, 4} and Y = {1, 5, 9, 11, 15, 16}
Determine which of the set are functions from X to Y.
(a) f1 = {(1, 1), (2, 11), (3, 1), (4, 15)}
Solution
(a) Given:
f1 = {(1, 1), (2, 11), (3, 1), (4, 15)}
f1 is a function from X to Y.
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