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Math Help - find a summation for a given series

  1. #1
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    find a summation for a given series

    1+a(a+1)+a(a+1)(a-2)(a+3)+a(a+1)(a-2)(a+3)(a-4)+a(a+1)(a-2)(a+3)(a-4)(a+5)


    what can be a general summation could be written in the form \sum_{n = 0}^{\infty}a_n
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  2. #2
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    a = first number in sequence
    r = ratio

    Hope that helps.
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  3. #3
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    Quote Originally Posted by mrbuttersworth View Post
    a = first number in sequence
    r = ratio

    Hope that helps.
    How did you get that result? This is not a geometric series.

    -Dan
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  4. #4
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    oh wow, I apologize, I read that one too quickly. Well in that case, I'm stumped. Sorry about that first response. That's a general solution for the sum of a geometric series.
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