America's toughest math exam

Putnam exam paper 2018: https://kskedlaya.org/putnam-archive/2018.pdf

2018 solutions: https://kskedlaya.org/putnam-archive/2018s.pdf

Putnam archive: https://kskedlaya.org/putnam-archive/

An alternative solution to A1: https://web.ma.utexas.edu/users/rusin/Putnam/2018/a1.pdf

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Видео America's toughest math exam канала Tibees