What is the sum of the first 5 terms? 2. Find the sum of the first 5 terms of the geometric series: 1/18 - 1/6 + 1/2 - ...
i think its 35/18
The common ratio is -3
So....the sum of the 1st 5 terms is
(1/18) [ 1 - (-3)^5 ] / [ 1 - (- 3 ) ] =
(1/18) [ 244 ] / 4 =
244 / 72 =
61 / 18