I like this problem....

來源: 亂彈 於 2009-11-10 20:38:21 [] [博客] [舊帖] [給我悄悄話] 閱讀數 : (97 bytes)
本帖於 2009-12-19 10:42:34 時間, 由普通用戶 康MM 編輯

The expected return is 0, but it seems that the probability of positive return is less than 1/2.

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