Which of the following functions from \( Z \) to \( Z \) are biject...

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Which of the following functions from \( Z \) to \( Z \) are bijections?
(a) \( f(x)=x^{3} \)
(b) \( f(x)=x+2 \)
(c) \( f(x)=2 x+1 \)
(d) \( f(x)=x^{2}+1 \)
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