User contributions
- 00:27, 20 December 2017 (diff | hist) . . (+18) . . 2010 AMC 12A Problems/Problem 21 (→Solution 2)
- 00:26, 20 December 2017 (diff | hist) . . (-13) . . 2010 AMC 12A Problems/Problem 21 (→Solution 2)
- 00:24, 20 December 2017 (diff | hist) . . (-4) . . 2010 AMC 12A Problems/Problem 21 (→Solution 2)
- 00:23, 20 December 2017 (diff | hist) . . (+282) . . 2010 AMC 12A Problems/Problem 21 (→Solution 2)