對頭！

來源: 倪達業於 2010-03-01 11:27:22 [檔案] [舊帖] [給我悄悄話] 閱讀數 : (279 bytes)

回答: 4th grade math problem 由 juja 於 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.