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MathNet 2010 — Part 02 Question 77

Math Olympiad Vault · MathNet 2010 — Part 02

Question 77

Two players, Maker and Breaker are playing the following game: Maker starts, and the players take turns choosing distinct numbers from the set $\{0, 1, \dots, 10\}$. Maker wins, if some of his chosen numbers form a strictly increasing arithmetic progression of length four, Breaker wins, if she manages to prevent this. Which of the players has a winning strategy?