User contributions
- 14:55, 28 October 2018 (diff | hist) . . (+5) . . 1990 AIME Problems/Problem 13 (→Problem)
- 14:52, 28 October 2018 (diff | hist) . . (+3) . . 1990 AIME Problems/Problem 13 (→Problem)
- 14:45, 28 October 2018 (diff | hist) . . (-109) . . 1990 AIME Problems/Problem 13 (→Solution)