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一个有趣的问题
source link: https://www.v2ex.com/t/461457
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分享发现 - @qwertyegg - 你在酒吧独自喝闷酒，旁边来了个美女，手里拿两个硬币，要你陪她玩这么个游戏:每人一个硬币，每次两人一起给出正反面如果:1. 两个正面，你赢 3 块钱2. 两个反面，你赢 1
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