From asymptotic notation

Question

F(n)=O{ [ f(n)]^2}

This statement is true or false  

With reason..

Answer 1

It is sometimes true:

For $f(n) = n$, its true, while $f(n) = \frac{1}{n}$ it is not true.

But it is always true for $f(n) = \Omega 1$

I hope you understood it now.

Comments

Why it can’t be O(1).

Answer 2

Not possible