# Monthly Archives: January 2011

## Statistics and student behaviour 2

continuation of a previous post. Last year, for the very first time I had my full lecture series made available as webcasts. I’ve always not been a fan of doing this and managed to avoid it so far because I … Continue reading

Intrigued by the following very pretty combinatorial identity attributed to R.C. Lyness. $\sum_{r=0}^n \binom{n}{r} \binom{p}{s+r} \binom{q+r}{m+n} = \sum_{r=0}^n \binom{n}{r} \binom{q}{m+r} \binom{p+r}{s+n}$ Note how it interchanges p with q and m with s. Not much information on this person is … Continue reading