Factorial — AMC & AIME Problems
Practice every real AMC 8, AMC 10, AMC 12, and AIME problem that uses Factorial — a arithmetic concept — each with a professionally curated solution, many with a video solution too, from LIVE by Po-Shen Loh. Browse all concepts or the full past-contest archive.
All problems are used with official legal permission of the Mathematical Association of America (MAA).
Filter by difficulty
These problems’ difficulty ratings come from real solve attempts on our platform. Tap a band or a contest to filter the list below, and tap a selected band again to include all difficulties. See the full difficulty guide.
AMC 8
2017 AMC 8 Problem 5 • 2017 AMC 8 Problem 19 • 2020 AMC 8 Problem 12 • 2022 AMC 8 Problem 17 • 2026 AMC 8 Problem 24
AMC 10
2004 AMC 10B Problem 6 • 2005 AMC 10A Problem 15 • 2005 AMC 10B Problem 22 • 2006 AMC 10B Problem 11 • 2010 AMC 10A Problem 24 • 2013 AMC 10B Problem 20 • 2014 AMC 10A Problem 8 • 2015 AMC 10B Problem 23 • 2016 AMC 10A Problem 1 • 2018 AMC 10A Problem 3 • 2019 AMC 10A Problem 2 • 2019 AMC 10A Problem 9 • 2019 AMC 10A Problem 25 • 2019 AMC 10B Problem 6 • 2019 AMC 10B Problem 14 • 2022 AMC 10B Problem 9 • 2023 AMC 10B Problem 15 • 2024 AMC 10A Problem 5 • 2024 AMC 10B Problem 2
AMC 12
1961 AMC 12 Problem 35 • 1965 AMC 12 Problem 33 • 1968 AMC 12 Problem 21 • 1969 AMC 12 Problem 23 • 1970 AMC 12 Problem 23 • 1973 AMC 12 Problem 19 • 1977 AMC 12 Problem 25 • 1982 AMC 12 Problem 8 • 1999 AMC 12 Problem 25 • 2001 AMC 12 Problem 5 • 2009 AMC 12B Problem 12 • 2013 AMC 12A Problem 17 • 2013 AMC 12B Problem 9 • 2013 AMC 12B Problem 15 • 2016 AMC 12A Problem 1 • 2019 AMC 12B Problem 4 • 2020 AMC 12B Problem 6 • 2024 AMC 12A Problem 4 • 2024 AMC 12B Problem 2