1.

Which of the following functions from Z to itself are bijections? aA. `f(x)=x^(3)`B. `f(x)=x+2`C. `f(x)=2x+1`D. `f(x)=x^(2) +1`

Answer» Correct Answer - B
Here, `f(x) =x +2impliesf(x_(1))=f(x_(2))`
`x_(1)+2=x_(2)+2implies x_(1)=x_(2)`
Let `" " y=x+2`
`x=y-2 in Z, AA y in x`
Hence, f(x) is one-one and onto.


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