Find the sum of the following GP

4-6+9-...-30.375

a=4 , r=-3/2

T_n=4(-3/2)^{n-1}=-30.375 ... how to solve this part if i take the logs ??

Results 1 to 4 of 4

- August 21st 2009, 04:11 AM #1

- Joined
- Jan 2009
- Posts
- 381

- August 21st 2009, 04:48 AM #2

- Joined
- Nov 2008
- From
- France
- Posts
- 1,458

- August 21st 2009, 08:25 AM #3

- Joined
- Jan 2009
- Posts
- 381

- August 21st 2009, 08:40 AM #4

- Joined
- Jul 2009
- Posts
- 397