help me with this again pls 1. Show that $\displaystyle \sum_{k=0}^{2+1}(\binom{n}{k}-\binom{n}{k-1})^2=\frac{2}{n+1}\binom{2n}{n} $
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Look at limit of the sum: 2+1 Is this right?
Last edited by streethot; Sep 18th 2009 at 06:50 AM.
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