对头！

来源: 倪达业于 2010-03-01 11:27:22 [档案] [旧帖] [给我悄悄话] 阅读数 : (279 bytes)

回答: 4th grade math problem 由 juja 于 2010-02-28 19:03:42

Another way to think of it:

If the game does NOT end in round n-1, then the probability of the game ending in round n is (1-125/216). Out of this probability, Sampson's chance is (25/216). So Sampson's total probability of winning is

(25/216)/(1-125/216) = 25/91.