回複：經典好題 - 比三扇門和羊有趣-大家來討論吧！

來源: 於 2010-06-19 08:19:43 [舊帖] [給我悄悄話] 本文已被閱讀：次

007 is too trick.What is expected value? If we get a box,there are two envelopes,one is x ,other is 10x,If we get x ,we change we earn 9x,if we get 10x we change,we lost 9x.So,changing expected value for earning is 0.This is not paradox,it is trick sentence but interesting.007 is funny.