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Math Help - How to find r for a GP summation?

  1. #1
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    How to find r for a GP summation?

    Hi

    Given such an equation, how do I find r? Thank you

    (1-r^m)/ (1-r)= s
    where m can be any positive whole number
    s can also be any positive number

    The equation is actually the summation for a GP series with a=1, so basically I want to know how to find r (ratio factor) for the sum of a GP .
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  2. #2
    Member dokrbb's Avatar
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    Re: How to find r for a GP summation?

    Maybe I'm wrong but it seems that something is missing from your formula, which you are supposed to use

    S= [ A (r ^n - 1 ) ]/ r - 1 = ( A - r An ) /(1 - r) , where r = A2/A1 = A3/A2 = An + 1/An,

    cheers
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