Revision as of 01:17, 20 October 2014 by Timneh(talk | contribs)(Created page with "== Problem == State the general rule illustrated here and prove it: <math> 1 ,\quad \begin{tabular}{cc} 1&1\\1&2\end{tabular} ,\quad \begin{tabular}{ccc} 1&1&1\\1&2&2\\1&2&3\e...")