Induction help (1 Viewer)

[Green Pup]

I've got series induction down, but I need help on divisibility:

Prove 5^n-1 is divisble by 4 for all positive integers.

 

[braintic]

Assuming you can test n=1 yourself:

Assumption:


Prove true for n+1:

 

[Green Pup]

Cheers mate