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gugeren的博客
有则写之，无则空之
	https://blog.creaders.net/u/5804/ > 复制 > 收藏本页

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gugeren

注册日期: 2012-01-06
访问总量: 3,063,232 次

· 【中国观察】马斯克计划推出免费

· 【美国时事通】当被捕杀者成为猎

· 【RRN】白帽逮捕一宾夕法尼亚州

· 【RRN】军方将清洗叛国军官

· 【RRN】FBI局长Wray被控叛国罪但

· 【美国时事通】川普胜选后，她要

· 【RRN】海军陆战队逮捕马约卡斯

【DIY】

【数学】

【美国大学申请】

· 美国劳工部对2010-2020年劳动力

【杂记】

【股票+金融】

【自己文章】

【转贴好文章】

· 【RRN】FBI局长Wray被控叛国罪但

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发表评论

敬告：您的浏览器已关闭活动脚本，开启后才可正常使用！

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评论：

趣味的数学-264

一个口袋里装有6个红球和8个蓝球。随机地从口袋里取出5个球放入一个红盒里，剩余的9个球放入一个蓝盒里。

求：

红球在绿盒中的数目，加上绿球在红盒中的数目之和不是素数的概率。

【The American Mathematical Monthly [AMM]，1960】