# How do you find the sum of the infinite geometric series a1= 343, r=7, and a4= -1?

##### 1 Answer

Mar 21, 2016

#### Explanation:

For what I can see from the problem. The number sequence may probably be like as follows;

343 -49 7 -1

in this case,

and

The formula for Sum of infinite geometric series with

God bless....I hope the explanation is useful.