I like this problem....

来源: 乱弹 于 2009-11-10 20:38:21 [] [博客] [旧帖] [给我悄悄话] 阅读数 : (97 bytes)
本帖于 2009-12-19 10:42:34 时间, 由普通用户 康MM 编辑

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

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