Functions Question 401
Question: . If $ f:R\to R $ , then $ f(x)=\ |x| $ is
[RPET 2000]
Options:
A) One-one but not onto
B) Onto but not one-one
C) One-one and onto
D) None of these
Show Answer
Answer:
Correct Answer: D
Solution:
$ f(-1)=f(1)=1 $ ;
$ \therefore $ function is many-one function. Obviously, f is not onto so f is neither one-one nor onto.