12 January 2019

• curprev 04:0504:05, 12 January 2019 Timneh talk contribs m 617 bytes +84 →Solution

5 December 2016

• curprev 19:5319:53, 5 December 2016 Mathisfun04 talk contribs 533 bytes +12 →Solution

20 October 2014

• curprev 00:1700:17, 20 October 2014 Timneh talk contribs 521 bytes +521 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..."