Let A = {1, 2, 3), B = {4, 5, 6, 7} and let f = {(1, 4), (2, 5), (3, 6)} be a function from A to B. Based on the given information, f is best defined as
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f is one-one
because f(1) = 4 ; f(2) = 5 ; f(3) = 6
No two elements of A have same f image.
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