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Which of the following functions from Z into Z are bijective? (a) f(x) = x3 (b) f(x) = x + 2 (c) f(x) = 2x

Which of the following functions from Z into Z are bijective?

(a) f(x) = x3

(b) f(x) = x + 2

(d) f(x) = x2 + 1

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