# How do you use summation notation to expression the sum #0.1+0.4+1.6+...+102.4#?

##### 1 Answer

Apr 15, 2018

#### Explanation:

Judging by the first three terms, they don't share a common difference, so it will not be an arithmetic series; however, we should test the ratio of the terms to determine whether we have a geometric series:

So, we have a geometric series with the first term

Since the series ends at

So, the series starts at