User contributions
- 19:43, 20 September 2010 (diff | hist) . . (+2) . . 2009 AIME II Problems/Problem 15
- 19:34, 20 September 2010 (diff | hist) . . (+22) . . 2009 AIME II Problems/Problem 15
- 19:32, 20 September 2010 (diff | hist) . . (+2,108) . . 2009 AIME II Problems/Problem 15
- 18:42, 20 September 2010 (diff | hist) . . (+55) . . 2009 AIME II Problems/Problem 15