Posted by **Mathew** on Sunday, March 15, 2009 at 10:45pm.

Here is the problem that I'm having trouble with:

Rewrite each series in a sigma notation and find its sum.

1+.09+.81+...

I have no idea how I find the common difference or ratio in that one.

- Algebra 2 / Trig -
**bobpursley**, Sunday, March 15, 2009 at 10:49pm
I don't think you will be able to do it with just those three terms.

- Algebra 2 / Trig -
**Reiny**, Sunday, March 15, 2009 at 10:58pm
perhaps you meant to type

1 + .09 + .0081 + ...

otherwise I agree with bob

If so, then

sum = [sigma] (.09)^(i-1) , i goes from 1 to infinity.

use S(infinity) = a/(1-r)

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