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Strehl Identity

The sum identity

\begin{displaymath}
\sum_{j=0}^\infty {n\choose j}^3=\sum_{k=0}^\infty {n\choose k}^2{2(n-k)\choose n},
\end{displaymath}

where ${n\choose k}$ is a Binomial Coefficient.

See also Binomial Coefficient




© 1996-9 Eric W. Weisstein
1999-05-26