The hardest test had this "easy" question with a surprising answer

The Putnam Exam has legendary difficulty: the average (median) score is usually 1 out of a possible 120 points. No calculators allowed though, and you have to prove everything very carefully. This is one of the easier questions from a past test.

Sources
http://www.math.utah.edu/~palais/mst/...
http://faculty.sfasu.edu/judsontw/put...
https://sites.math.northwestern.edu/~...
https://www.theringer.com/nba/2018/12...
https://www.basketball-reference.com/...

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