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Which of the following function from Z t...

Which of the following function from Z to itself are bijections? `f(x)=x^3` (b) `f(x)=x+2` `f(x)=2x+1` (d) `f(x)=x^2+x`

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The correct Answer is:
b
(b) Clearly, `f(x)` must be `x+2` as for this function, each image has its preimage and each image has one and only one preimage.
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