plese show your steps.

來源: 於 2010-04-15 08:23:59 [舊帖] [給我悄悄話] 本文已被閱讀：次

First time I think it seems 1/3(5/6+5/6+5/6)=5/6.
Second time I...........1/3(5/6+5/6+3/6),as maybe someone can't wait 20 minites.