Library /Selected Problems from Open Contests

Selected Problems from Open Contests

12 problems here, rated 4.5 to 6.8 on our scale (AIME to National Olympiad). 12 of them ask for a proof.

Algebra 1Combinatorics 2Geometry 5Number theory 4

#	Topic	Diff	Type	Year
1	Geometry	4.5	proof	—	open
2	Geometry	4.7	proof	—	open
3	Number theory	4.7	proof	—	open
4	Algebra	4.7	proof	—	open
5	Geometry	5.3	proof	—	open
6	Number theory	5.3	proof	—	open
7	Geometry	5.3	proof	—	open
8	Number theory	5.4	proof	—	open
9	Geometry	5.5	proof	—	open
10	Combinatorics	5.9	proof	—	open
11	Combinatorics	6.5	proof	—	open
12	Number theory	6.8	proof	—	open

These are sorted by difficulty within the competition, but they aren't a course. The track is the route through, drawn from all the sources at once.