對頭！

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.

所有跟帖： 

• 對不起，不懂。這個結果應該是每輪有人贏得機會是91/216 -Mr.Coffee- ♂ (77 bytes) () 03/02/2010 postreply 12:13:08