The How and Why of Mathematics | Maths Olympiad Questions - 2017 IMO C1 @THaWoM | Uploaded 5 years ago | Updated 1 hour ago
I'm starting a series of videos on olympiad questions from the International Mathematical Olympiad, the Australian Mathematical Olympiad, the Putnam competition, and any others that take my fancy. This one covers question C1 (C for combinatorics) from the 2017 IMO.

The olympiad paper can be found at http://imo-official.org/problems/IMO2017SL.pdf
The Martin Gardner book I mentioned is "My Best Mathematical and Logic Puzzles" amazon.com/Mathematical-Logic-Puzzles-Dover-Recreational-ebook/dp/B00DP7UJMY
The other author I mentioned is Ian Stewart: amazon.com/Ian-Stewart/e/B00URW7B2G
Paul Lockhart's article, "A Mathematician's Lament" can be found at maa.org/external_archive/devlin/LockhartsLament.pdf