在一个坛子中装有
个除颜色外完全相同的玻璃球,其中有
个红的,
个蓝的,
个绿的,
个黄的,从中任取一球,放回后,再取一球.则第一次取出红球且第二次取出黄球的概率为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c748e40ba21ac5063d3bccaa57ef278.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
更新时间:2023-03-12 20:13:04
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【推荐2】盒中有大小相同的6个红球,4个白球,现从盒中任取1球,记住颜色后再放回盒中,连续摸取4次.设
表示连续摸取4次中取得红球的次数,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/200594422abc2e5676fa4fe713200c48.png)
___________ ,
的数学期望![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d419c30ff40e9b368a3f151f639dac8f.png)
___________ .
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