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OpenStudy (anonymous):
Find a formula for the nth partial sum of each series and use it to find the series' sum if the series converges: 1- 1/2 + 1/4 - 1/8 +...+[(-1)^(n-1)](1/(2^n)-1)+...
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hartnn (hartnn):
break this series in to 2 series, both will be geometric series with common ratio 1/4, calculate sum of each series separately.
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