1.

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`

Answer» Correct Answer - 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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