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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` |
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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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