Let the function f: R-{-b}->R-{1} be def...

Let the function `f: R-{-b}->R-{1}` be defined by `f(x)=(x+a)/(x+b)` , `a!=b` , then (a) `f` is one-one but not onto (b) `f` is onto but not one-one (c) `f` is both one-one and onto (d) none of these

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