概率论中抽球的问题一直搞不懂,如题.比如一袋色球里,有三个白球,两个红球和三个黑球,现从中随机任取4个球,设x为其中白球数,Y为红球书,求(x,y)的概率分布律.怎么算他一共几种抽法啊.就
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![概率论中抽球的问题一直搞不懂,如题.比如一袋色球里,有三个白球,两个红球和三个黑球,现从中随机任取4个球,设x为其中白球数,Y为红球书,求(x,y)的概率分布律.怎么算他一共几种抽法啊.就](/uploads/image/z/12341793-57-3.jpg?t=%E6%A6%82%E7%8E%87%E8%AE%BA%E4%B8%AD%E6%8A%BD%E7%90%83%E7%9A%84%E9%97%AE%E9%A2%98%E4%B8%80%E7%9B%B4%E6%90%9E%E4%B8%8D%E6%87%82%2C%E5%A6%82%E9%A2%98.%E6%AF%94%E5%A6%82%E4%B8%80%E8%A2%8B%E8%89%B2%E7%90%83%E9%87%8C%2C%E6%9C%89%E4%B8%89%E4%B8%AA%E7%99%BD%E7%90%83%2C%E4%B8%A4%E4%B8%AA%E7%BA%A2%E7%90%83%E5%92%8C%E4%B8%89%E4%B8%AA%E9%BB%91%E7%90%83%2C%E7%8E%B0%E4%BB%8E%E4%B8%AD%E9%9A%8F%E6%9C%BA%E4%BB%BB%E5%8F%964%E4%B8%AA%E7%90%83%2C%E8%AE%BEx%E4%B8%BA%E5%85%B6%E4%B8%AD%E7%99%BD%E7%90%83%E6%95%B0%2CY%E4%B8%BA%E7%BA%A2%E7%90%83%E4%B9%A6%2C%E6%B1%82%EF%BC%88x%2Cy%EF%BC%89%E7%9A%84%E6%A6%82%E7%8E%87%E5%88%86%E5%B8%83%E5%BE%8B.%E6%80%8E%E4%B9%88%E7%AE%97%E4%BB%96%E4%B8%80%E5%85%B1%E5%87%A0%E7%A7%8D%E6%8A%BD%E6%B3%95%E5%95%8A.%E5%B0%B1)
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