One step further

来源: ca981 于 2014-09-30 11:51:04 [] [博客] [旧帖] [给我悄悄话] 本文已被阅读： 0 次 (495 bytes)
We can further divide case B into B2 and B3, where B2 is the door opened by host, and B3 is the third one.

P_B2 = 0 (host will only open door with Goat), Therefore,

P_B3 = P_B - P_B2 = 2/3 - 0 = 2 / 3 

请您先登陆，再发跟帖！

发现Adblock插件

如要继续浏览
请支持本站 请务必在本站关闭/移除任何Adblock

关闭Adblock后 请点击

请参考如何关闭Adblock/Adblock plus

安装Adblock plus用户请点击浏览器图标
选择“Disable on www.wenxuecity.com”

安装Adblock用户请点击图标
选择“don't run on pages on this domain”