How can i calculate this sum?

Thanks for any kind of help.

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- Jan 11th 2009, 06:58 PMJohn GHelp in binomial theorem
How can i calculate this sum?

Thanks for any kind of help. - Jan 11th 2009, 09:30 PMThePerfectHacker
Remember, .

This sum can be written as,

Using the formula above on boxed term we get,