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International Mathematical Olympiad - IMO

International Mathematical Olympiad - IMO

Thru 2003 there were 44 IMOs, each with 6 problems, except for 1960 and 1962 which each had 7, giving a total 266 problems in all.

The IMO got noticeably harder in the late 1980s. There are two separate papers of 3 problems each. The idea is that in each paper the problems are in order of increasing difficulty. That is not always true. But in the last 10 years the last problem in the second paper has usually been hard.

Many thanks to all those who supplied solutions where I failed, or pointed out errors, or supplied better solutions. There are still some solutions which are clumsy or inelegant, and maybe even some which are wrong (although I am not aware of any). All suggestions for improvement would be most welcome. [email: hoahkh at gmail dot com]

There are some technical notes on formats etc below.

  • 1st International Mathematical Olympiad 1959
  • 2nd International Mathematical Olympiad 1960
  • 3rd International Mathematical Olympiad 1961
  • 4th International Mathematical Olympiad 1962
  • 5th International Mathematical Olympiad 1963
  • 6th International Mathematical Olympiad 1964
  • 7th International Mathematical Olympiad 1965
  • 8th International Mathematical Olympiad 1966
  • 9th International Mathematical Olympiad 1967
  • 10th International Mathematical Olympiad 1968
  • 11th International Mathematical Olympiad 1969
  • 12th International Mathematical Olympiad 1970
  • 13th International Mathematical Olympiad 1971
  • 14th International Mathematical Olympiad 1972
  • 15th International Mathematical Olympiad 1973
  • 16th International Mathematical Olympiad 1974
  • 17th International Mathematical Olympiad 1975
  • 18th International Mathematical Olympiad 1976
  • 19th International Mathematical Olympiad 1977
  • 20th International Mathematical Olympiad 1978
  • 21st International Mathematical Olympiad 1979
  • 22nd International Mathematical Olympiad 1981
  • 23rd International Mathematical Olympiad 1982
  • 24th International Mathematical Olympiad 1983
  • 25th International Mathematical Olympiad 1984
  • 26th International Mathematical Olympiad 1985
  • 27th International Mathematical Olympiad 1986
  • 28th International Mathematical Olympiad 1987
  • 29th International Mathematical Olympiad 1988
  • 30th International Mathematical Olympiad 1989
  • 31st International Mathematical Olympiad 1990
  • 32nd International Mathematical Olympiad 1991
  • 33rd International Mathematical Olympiad 1992
  • 34th International Mathematical Olympiad 1993
  • 35th International Mathematical Olympiad 1994
  • 36th International Mathematical Olympiad 1995
  • 37th International Mathematical Olympiad 1996
  • 38th International Mathematical Olympiad 1997
  • 39th International Mathematical Olympiad 1998
  • 40th International Mathematical Olympiad 1999
  • 41st International Mathematical Olympiad 2000
  • 42nd International Mathematical Olympiad 2001
  • 43rd International Mathematical Olympiad 2002
  • 44th International Mathematical Olympiad 2003
  • Related Lessons in International Mathematical Olympiad - IMO
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