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In which of the following function, r...

In which of the following function, range is not singleton set `f(x)=[x]+[-x]` (b) `f(x)={x}+{-x}` `f(x)=|sgn(x)|` (d) `f(x)=[sqrt(x-[x])` where `[x],{x},a n dsgn(x)` are greatest integer function, fractional part function and signum function respectively.

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