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MathNet 2019-part-07 — 184 problems (EN–VI) Question 176

Math Olympiad Vault · MathNet 2019-part-07 — 184 problems (EN–VI)

Question 176

Alice and Bob play a game. There are 9 cards numbered 1 through 9 on a table, and the players alternate taking the cards, with Alice going first. A player wins if at any point they hold three cards with sum $15$; if all nine cards are taken before this occurs, the game is a tie. Does either player have a winning strategy?