could I get some help with evaluating this sum.

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- Nov 4th 2008, 09:11 AMpandakrapsummation evaluation
could I get some help with evaluating this sum.

- Nov 4th 2008, 09:36 AMPaulRS
Note that your sum is equal to:

And that corresponds to the coefficient of in the product: ( use the Binomial Theorem)

On the other hand:

By the Binomial Theorem:

So we recognise the coefficient of as - Nov 4th 2008, 10:18 AMpandakrap:)
thanks a bunch