User contributions
- 22:53, 21 October 2024 (diff | hist) . . (+15) . . m 2015 AMC 10B Problems/Problem 12 ((I noticed the video link led to question 11, not 12, so I matched the link. )) (current)
- 22:31, 17 October 2024 (diff | hist) . . (+78) . . Pentagonal number
