Geometric Series Formula Quizmaster : MATHguide
Geometric Series Quizmaster: MATHguide
Review the Lesson | MATHguide homepage Updated June 18th, 2023

Status: Waiting for your answers.

Use the first 9 terms of the following geometric series for the problem below:

15 - 60 + 240 - 960 + ...

What is the value of the common ratio? r =
What is the sum of the first 9 terms?
(to the nearest tenth) 		S9 =