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On Mon, 21 Apr 2008, Stephen Montgomery-Smith wrote:
I must have typed it wrong. It should be
N
Sum (N choose i) x(x+i)^(i-1) y(y+N-i)^(N-i-1) = (x+y)(x+y+N)^(N-1)
i=0
Now it seems to be right, but that didn't help me much. ;-)
That looks like a hard one. So I'll just have to admire your persistence
and give up now and use the 6 months I'm saving for other activities!
Mike
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