Posted by **David** on Monday, December 10, 2007 at 12:52am.

The question is, if f(x) is equal to the series from n to infinity of a sub n times (x-7)^n for all n, find a formula for a sub 10. (I apologize for typing it out in the way that I did, but it was the only way I could.

I don't quite understand what is being asked here. I tried writing an equation where the series is equal to (a sub n)/(1-r), but that didn't seem to work. Could someone explain to me what I am supposed to do here?

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