进MO不容易,每年毕业生有2次以上的全美不超过50人

https://www.yumpu.com/en/document/read/43158978/2015-usamo-qualifier-list

 

https://www.maa.org/sites/default/files/USAMO%20Qualifiers%202016_0.pdf

https://www.maa.org/sites/default/files/USAMOQualifier04042017.pdf

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