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Which of the following functions has inv...

Which of the following functions has inverse function? `f: ZrarrZ`defined by`f(x)=x+2` `f: ZrarrZ`defined by`f(x)=2x` `f: ZrarrZ`defined byy`f(x)=x` `f: ZrarrZ`defined by`f(x)=|x|`

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