How do I evaluate without havng to add up each element?

Thanks

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- Sep 5th 2006, 06:06 PMchanceyEvaluation a non-linear series?
How do I evaluate without havng to add up each element?

Thanks - Sep 5th 2006, 06:47 PMThePerfectHackerQuote:

Originally Posted by**chancey**

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Thus,

Use geometric sum formula,

Simplify,

- Sep 5th 2006, 07:50 PMchanceyQuote:

Originally Posted by**ThePerfectHacker**

I did it this way:

Which is the same answer as yours, however the answer in the book says . They must of added the 20 instead of subtracted it. OK thanks - Sep 5th 2006, 07:53 PMThePerfectHackerQuote:

Originally Posted by**chancey**