Hey, I have several questions like this and really need some help on the first one so that I can get started. I'd be so grateful for an answer and some workings to be shown on this

The question I'm stuck on is:

Prove, by induction on n, that

2 + 5 + 8 + ..... + (3n - 1) = 1/2 n(3n + 1)

For all integers n >= 1

(The n>=1 part was meant to be: for n greater than or equal to 1. I couldn't find the symbol :/ )

Thanks in advance