- #1

ChelseaL

- 22

- 0

Given that the sum of the first n terms of series, s, is 9-3

show that the s is a geometric progression.

Do I use the formula a

_{2-n}show that the s is a geometric progression.

Do I use the formula a

_{n}= a_{r}^{n-1}? And if so, how do I apply it?
Last edited: