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Updated February 12th, 2006

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Use the first 12 terms of the following geometric series for the problem below:

4, -6.8, 11.56, -19.652, ...

What is the value of the common ratio ? r =

What is the sum of the first 12 terms? S₁₂ =

Use the first 12 terms of the following geometric series for the problem below: 4, -6.8, 11.56, -19.652, ...
What is the value of the common ratio ?	r =
What is the sum of the first 12 terms?	S₁₂ =