5 March 2023

• curprev 03:3603:36, 5 March 2023 Wzs26843545602 talk contribs 3,728 bytes +193 →Solution
• curprev 03:2703:27, 5 March 2023 Wzs26843545602 talk contribs 3,535 bytes −97 No edit summary

6 November 2018

• curprev 20:3520:35, 6 November 2018 Cooljoseph talk contribs 3,632 bytes +3,300 Added in a solution. Sorry if the solution is hard to follow and for the frequent change in variables.

21 April 2018

• curprev 10:5210:52, 21 April 2018 Sujaykazi talk contribs 332 bytes +332 Created page with "==Problem 6== Let <math>a_n</math> be the number of permutations <math>(x_1, x_2, \dots, x_n)</math> of the numbers <math>(1,2,\dots, n)</math> such that the <math>n</math> ra..."