Geometric Series Formula Quizmaster : MATHguide
Geometric Series Quizmaster: MATHguide
Review the Lesson | MATHguide homepage Updated March 7th, 2019

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Use the first 13 terms of the following geometric series for the problem below:

-12 + 54 - 243 + 1093.5 + ...

What is the value of the common ratio? r =
What is the sum of the first 13 terms?
(to the nearest tenth) 		S13 =