AMC 10 Step by Step
2020 AMC 10BProblem 16P16-20~3 minPrint

Bela and Jenn play the following game on the closed interval [0,n][0, n] of the real number line, where nn is a fixed integer greater than 44 . They take turns playing, with Bela going first. At his first turn, Bela chooses any real number in the interval [0,n][0, n] . Thereafter, the player whose turn it is chooses a real number that is more than one unit away from all numbers previously chosen by either player. A player unable to choose such a number loses. Using optimal strategy, which player will win the game?

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Problem © Mathematical Association of America (MAA), American Mathematics Competitions. Reproduced for non-commercial educational use. Solution and commentary are original to this site.