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On the waiting time in a janken game

Consider a janken game (scissors-paper-rock game) started by n players such that (1) the first round is played by n players, (2) the losers of each round (if any) retire from the rest of the game, and (3) the game ends when only one player (winner) is left. Let W n be the number of rounds played thr...

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Bibliographic Details
Published in:Journal of applied probability 2000-06, Vol.37 (2), p.601-605
Main Authors: Maehara, Hiroshi, Ueda, Sumie
Format: Article
Language:English
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Summary:Consider a janken game (scissors-paper-rock game) started by n players such that (1) the first round is played by n players, (2) the losers of each round (if any) retire from the rest of the game, and (3) the game ends when only one player (winner) is left. Let W n be the number of rounds played through the game. Among other things, it is proved that (2/3) n W n is asymptotically (as n → ∞) distributed according to the exponential distribution with mean ⅓, provided that each player chooses one of the three strategies (scissors, paper, rock) with equal probability and independently from other players in any round.
ISSN:0021-9002
1475-6072
DOI:10.1239/jap/1014842562