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Math Help - Binomials

  1. #1
    Newbie
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    Sep 2009
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    15

    Binomials

    help me with this again pls

    1. Show that

    <br />
\sum_{k=0}^{2+1}(\binom{n}{k}-\binom{n}{k-1})^2=\frac{2}{n+1}\binom{2n}{n}<br />
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  2. #2
    Junior Member
    Joined
    May 2009
    Posts
    36
    Look at limit of the sum: 2+1

    Is this right?
    Last edited by streethot; September 18th 2009 at 06:50 AM.
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