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Re: Summation without Mathematica



Sum[x^3(7/8)^x,{x,1,Infinity}]

18872

--
Allan
---------------------
Allan Hayes
Mathematica Training and Consulting
Leicester UK
www.haystack.demon.co.uk
hay at haystack.demon.co.uk
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" mrtommorris" <mor3752 at alltel.net> wrote in message
news:97a7hg$al7 at smc.vnet.net...
> Can someone help me to evaluate the sum from x=1 to infinity for the
> expression x^3(7/8)^x. I know the formulas that will evaluate either
alone.
> But the product is giving me difficulty.
>
>
>




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