If f : I → I be defined by f(x) = [x + 1], where [.] denotes the greatest integer function, then f - 1(x) is equal to
Answer & explanation
Correct answer: option 1
since the domain of f is I, hence f(x) is one – one and onto and [x] = x
⇒ f(x) = x + 1
⇒ f – 1(x) = x – 1
Hence (1) is the correct answer.