Functions Question 661

Question: Which of the following function is invertible

[AMU 2001]

Options:

A) $ f(x)=2^{x} $

B) $ f(x)=x^{3}-x $

C) $ f(x)=x^{2} $

D) None of these

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Answer:

Correct Answer: A

Solution:

A function is invertible if it is one-one and onto.