"triple_r" <nomail@nomail> wrote:
> "Chambers" <bdc### [at] yahoocom> wrote:
>
> > The original function is f(x) = M*R*(D^x), where M, R and D are constants.
> >
> > I'd be using the function g(A) = sum of f(x), where x=0..A
>
> If x is just integers from zero to a, then each term differs by an additional
> factor of D.  Then you have the sum of a geometric series,

Thanks; it's been long enough that I'd completely forgotten the geometric series
summation formula!

....Chambers

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