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OpenStudy (anonymous):
Find the sum of the geometric series with a1=-1 r=-2 and a 10 =512, am I wrong if I say there isn't enough information?
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OpenStudy (campbell_st):
well to find the sum, you need to know how many terms you are adding the formula is \[S_{n} =\frac{a_{1}(1 - r^n)}{1 - r}\]
OpenStudy (anonymous):
well that's the only informatiom I'm given, soo?
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