Math puzzles: classic riddles in counting, geometry, probability, and game theory Presh Talwalkar Copyright Presh Talwalkar, 2012 All rights reserved Acknowledgements I want to thank readers of Mind Your De- cisions for their continued support. I always loved math puzzles and I'm fortunate for the community of readers that have suggested puzzles to me and offered ingenious solutions. These puzzles are a collection of problems that I have read over the years in books, math competitions, websites, and emails. I have credited original sources when aware, but if there are any omissions please let me know at