Got another problem on induction, this time I don't even know who to start and what to do.

What I want to do is to show that $\displaystyle 3^n \geq n^3$ is true for all

$\displaystyle n \in$N.

Here we define the natural set of numbers decluding 0.

From here I don't know much about what to do but show it true for n=1, witch I of course have done.

Anyone got any ideas?