Geometric Series Formula Quizmaster : MATHguide
Geometric Series Quizmaster: MATHguide
Review the Lesson | MATHguide homepage Updated December 4th, 2016


Status: Waiting for your answers.

Use the first 7 terms of the following geometric series for the problem below:

-20 + 40 - 80 + 160 + ...

What is the value of the common ratio? r =
What is the sum of the first 7 terms?
(to the nearest tenth)
S7 =