Question

http://prntscr.com/d64je3

Answer 1

@mhchen Rakesh?

Answer 2

Actually both of them are right.

You see the exponent of the first one, (n-1), would mean this:
\[g_{n}=g_{1}*r^{n-1}\]
And g1 is the first term, which is 100.

For the exponent of the second one, (n), would mean this:
\[g_{n}=g_{0}*r^{n}\]
And g0 is the term before the first term, which would be multiplying 100 * 2 = 200.

So both are correct.

Answer 3

Ahh okay tysm!!