小學數學題

小學數學競賽題：

Three kids A, B, C are playing a dice game. A goes first, B second, and
C third. The first person to roll a three wins and the game is over. The
dice are continuously passed in the above order until someone wins. What is the probability that C wins?

我可以用無限序列的公式做出來， 不過， 有別的方法嗎？ 很好奇小學生怎麽解這道題。

所有跟帖： 

• 回複：小學數學題 -endofsuburbia- ♂ (50 bytes) () 03/25/2009 postreply 17:17:26

• 多謝多謝。 -bujidao- ♂ (0 bytes) () 03/26/2009 postreply 09:29:39

• 這是哈佛大學某年的博士資格考試題嘛！ --閑雲野鶴-- ♂ (0 bytes) () 03/26/2009 postreply 09:20:11