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5. Consider the function f : Z+ -> Z+ defined by f(n) = 2n 3n if n is even. Let S = {1, 2, 3, 4,5,6}. Determine the following. (a) f(S) = (b) f-1(S)= (c) f-1(f(S) = (d) f(f-1(S)= if n is odd,

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