"The International Mathematical Olympiad (IMO) is the World Championship Mathematics Competition for High School students and is held annually in a different country. The first IMO was held in 1959 in Romania, with 7 countries participating. It has gradually expanded to over 80 countries from 5 continents."
The usual size of an official delegation to an IMO is (a maximum of) six student competitors and (a maximum of) two leaders. There is no official "team". The student competitors write two papers, on consecutive days, each paper consisting of three questions. Each question is worth seven marks. Students work individually over a two day period on six challenging problems, presenting their solutions as essay-style proofs akin to those produced by research mathematicians.
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