Geometric Series Formula Quizmaster : MATHguide
Geometric Series Quizmaster: MATHguide
Review the Lesson | MATHguide homepage Updated March 3rd, 2018


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Use the first 8 terms of the following geometric series for the problem below:

15 - 45 + 135 - 405 + ...

What is the value of the common ratio? r =
What is the sum of the first 8 terms?
(to the nearest tenth)
S8 =