If f : [0, ∞) → [0, ∞) and $f(x) = \frac{x}{1+x}$, then f is
Answer & explanation
Correct answer: option 2
The given function is $f(x) = \frac{x}{1+x}=1-\frac{1}{1+x}$.
Hence its range is [0, 1) which is a subset of [0, ∞).
Also the function is one-one.
Hence (B) is the correct answer.