Assuming that the series is geometric, find the sum (correct up to 8 decimal places) of the first 25 terms of the following series:

Thanks

jpatrie

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- Oct 2nd 2008, 08:04 PMjpatrieFew homework questions I'm having trouble with.
Assuming that the series is geometric, find the sum (correct up to 8 decimal places) of the first 25 terms of the following series:

Thanks

jpatrie - Oct 2nd 2008, 08:08 PMicemanfan
The sum of a geometric series through the first n terms, if the first term is one, is , where r is the common ratio. In your example, r = -1/2. So the sum is .

- Oct 2nd 2008, 08:13 PMProve It