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Check which of the following function is...

Check which of the following function is onto and into.
(i) f :X `rarr` Y, given by f(x) = 3x, where X = {0, 1, 2 and Y = {0,3,6).
(ii) f: Z `rarr` Z, given by f(x) = 3x + 2, (Z = set of integers).

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