Putnam 2021 Math Competition! (A1 to A3)

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Putnam competition 2021 is here! The Putnam Competition, the preeminent mathematics competition for undergraduate college students in the United States and Canada, takes place annually on the first Saturday of December. The competition consists of two 3-hour sessions, one in the morning and one in the afternoon. During each session, participants work individually on 6 challenging mathematical problems.

Solutions and discussion of problems A1, A2, A3

82nd William Lowell Putnam Mathematical Competition
00:00​ Introduction
00:23​ Problem A1 - Combinatorics
03:17​ Problem A2 - Analysis / Calculus
08:20​ Problem A3 - Geometry

Discussion of more problems will be coming!

What do you think of this contest in comparison to the International Mathematical Olympiad (IMO)?