Tricky binomial question (1 Viewer)

[Broseph]

I've been a bit stumped on this particular question, specifically the first part.

If anyone could point me in the right direction I'd be super grateful!!

Thanks

 

[seanieg89]

Hint: The LHS is a geometric series.

 

[Broseph]

Ahh got it, thanks heaps I need to make those connections better.