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sheepbird (sheepbird) 于 (Wed Mar 19 17:11:38 2008) 提到:
In one country, the demographic situation is the following. Parents stop
having children after they have a son. What is the proportion of the male to
female population after 1000 years?
直觉上好像应该还是50% 对50%。 可是不知道用什么理论解释。
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mediocre (forever tango) 于 (Wed Mar 19 18:47:11 2008) 提到:
几何分布
to
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stchenhua (stchenhua) 于 (
