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随手整理，这应该是个长期工程
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- 杂题，重男轻女，生到一个男孩就停止，会影响性别比例嘛？不会，还是$1:1$。男孩$\frac{1}{2} + \frac{1}{4} + \frac{1}{8} + … + \frac{1}{2^{n}} = 1 - \frac{1}{2^{n}}\approx 1$，而女孩则是$\frac{1}{4} + \frac{2}{8} + \frac{3}{16} … + \frac{n-1}{2^{n}}$
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Written on July 24, 2020