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Let A={1,2,3,4}, B={1,5,9,11,15,16} and ...

Let A={1,2,3,4}, B={1,5,9,11,15,16} and f={(1,5),(2,9),(3,1),(4,5),(2,11)}. Are the following true?
(i) f is a relation from A to B.
(ii) f is a function from A to B. Justify your answer in each case.

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