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Let f:(4,6)vec(6,8) be a function define...

Let `f:(4,6)vec(6,8)` be a function defined by `f(x)=x+[x/2]dotw h e r e[dot]` denotes the greatest integer function, then `f^(-1)(x)` is equal to (A) `x-2` (B) `x-[x//2]` (C) `-x-2` (D) none of these

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