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A= {5, 10, 15, 20}, B= {2,4,6,8, 10}. Ou...

A= {5, 10, 15, 20}, B= {2,4,6,8, 10}. Out of the following, which is a function?
(a) {(5, 2), (10, 4), (15,6), (20, 9)}
(b) {(5, 2), (10, 4)}
(c ) {(5, 2), (10, 4), (15,6), (20), 10)}
(d) {(5, 1), (5, 10), (15, 6), (20,9)}

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