其實，不管第幾次取球，每次取出白色的可能性是一樣的。

來源: 戲雨飛鷹於 2010-01-10 21:58:01 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.