a,b,c三只盒子,a中有4个白球,2个黑球,b中有2个白球1个黑球,c 中黑球3个白球3个今掷一骰子.若出现点数123,选a盒子,点数4,选b盒子,其余选c.在abc中任取一球.问取到白球的几率(4/9)
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![a,b,c三只盒子,a中有4个白球,2个黑球,b中有2个白球1个黑球,c 中黑球3个白球3个今掷一骰子.若出现点数123,选a盒子,点数4,选b盒子,其余选c.在abc中任取一球.问取到白球的几率(4/9)](/uploads/image/z/3867075-27-5.jpg?t=a%2Cb%2Cc%E4%B8%89%E5%8F%AA%E7%9B%92%E5%AD%90%2Ca%E4%B8%AD%E6%9C%894%E4%B8%AA%E7%99%BD%E7%90%83%2C2%E4%B8%AA%E9%BB%91%E7%90%83%2Cb%E4%B8%AD%E6%9C%892%E4%B8%AA%E7%99%BD%E7%90%831%E4%B8%AA%E9%BB%91%E7%90%83%2Cc+%E4%B8%AD%E9%BB%91%E7%90%833%E4%B8%AA%E7%99%BD%E7%90%833%E4%B8%AA%E4%BB%8A%E6%8E%B7%E4%B8%80%E9%AA%B0%E5%AD%90.%E8%8B%A5%E5%87%BA%E7%8E%B0%E7%82%B9%E6%95%B0123%2C%E9%80%89a%E7%9B%92%E5%AD%90%2C%E7%82%B9%E6%95%B04%2C%E9%80%89b%E7%9B%92%E5%AD%90%2C%E5%85%B6%E4%BD%99%E9%80%89c.%E5%9C%A8abc%E4%B8%AD%E4%BB%BB%E5%8F%96%E4%B8%80%E7%90%83.%E9%97%AE%E5%8F%96%E5%88%B0%E7%99%BD%E7%90%83%E7%9A%84%E5%87%A0%E7%8E%87%EF%BC%884%2F9%29)
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a,b,c三只盒子,a中有4个白球,2个黑球,b中有2个白球1个黑球,c 中黑球3个白球3个今掷一骰子.若出现点数123,选a盒子,点数4,选b盒子,其余选c.在abc中任取一球.问取到白球的几率(4/9)
a,b,c三只盒子,a中有4个白球,2个黑球,b中有2个白球1个黑球,c 中黑球3个白球3个
今掷一骰子.若出现点数123,选a盒子,点数4,选b盒子,其余选c.在abc中任取一球.
问取到白球的几率(4/9)
a,b,c三只盒子,a中有4个白球,2个黑球,b中有2个白球1个黑球,c 中黑球3个白球3个今掷一骰子.若出现点数123,选a盒子,点数4,选b盒子,其余选c.在abc中任取一球.问取到白球的几率(4/9)
答案是:选中a盒子同时抽到白球的概率+选中b盒子同时抽到白球的概率+选中c盒子同时抽到白球的概率.
为:3/6*4/6+1/6*2/3+2/6*3/6=1/3+1/9+1/6=11/18.
4/6X3/6十2/3x1/6十3/6x2/6=7/9