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Math Help - Am I summing this correctly?

  1. #1
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    Am I summing this correctly?

    I have this series

    (1-v^39) + (1-v^36) +(1-v^33).....+(1-v^3)

    I added up all the 1's and was left with:

    13-(v^3 +v^6....+v^39)

    Factored out v^3

    13- v^3(1+v^3 +..... v^36)

    So I get 13 - v^3 * [(1-v^37)/(1-v)]
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  2. #2
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    Quote Originally Posted by babbagandu View Post
    I have this series

    (1-v^39) + (1-v^36) +(1-v^33).....+(1-v^3)

    I added up all the 1's and was left with:

    13-(v^3 +v^6....+v^39)

    Factored out v^3

    13- v^3(1+v^3 +..... v^36)

    So I get 13 - v^3 * [(1-v^37)/(1-v)]
    I think in the last term you want

     <br />
\frac{1-v^{39}}{1-v^3}<br />
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  3. #3
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    Quote Originally Posted by Danny View Post
    I think in the last term you want

     <br />
\frac{1-v^{39}}{1-v^3}<br />

    Ooooh. Ok thanks
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