From 1972 until 1995 each competition had a single paper of 5 questions (to be solved in 3 1/2 hours). Thereafter each competition has had two papers each with 3 questions (originally 3 hours for each paper, 4½ hours from 2002). So there are a total of 168 problems to date.

I have put up solutions for all problems.

 

Archive

1st USAMO 1972
2nd USAMO 1973
3rd USAMO 1974
4th USAMO 1975
5th USAMO 1976
6th USAMO 1977
7th USAMO 1978
8th USAMO 1979
9th USAMO 1980
10th USAMO 1981
11th USAMO 1982
12th USAMO 1983
13th USAMO 1984
14th USAMO 1985
15th USAMO 1986
16th USAMO 1987
17th USAMO 1988
18th USAMO 1989
19th USAMO 1990
20th USAMO 1991
21st USAMO 1992
22nd USAMO 1993
23rd USAMO 1994
24th USAMO 1995
25th USAMO 1996
26th USAMO 1997
27th USAMO 1998
28th USAMO 1999
29th USAMO 2000
30th USAMO 2001
31st USAMO 2002
32nd USAMO 2003
 
 
 
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© John Scholes
jscholes@kalva.demon.co.uk
27 Aug 2002
Last corrected/updated 6 Nov 03