UPSKILL MATH PLUS

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Let \(A = \{1, 2, 3, 4\}\) and \(B = \{4, 8, 9, 10\}\). A function \(f : A \rightarrow B\) given by \(f = \{(1, 4), (2, 8), (3, 9), (4, 10)\}\) is a: