题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020181616-56833.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020181616-69080.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
由
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020181617-79983.png)
在
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020181616-56833.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020181617-68794.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020181617-99830.png)
在
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020181616-56833.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020181618-65503.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020181618-20879.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020181618-14165.png)
碑正确答案为
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020181619-66093.png)
核心考点
举一反三
从装有n+1个球(其中n个白球,1个黑球)的口袋中取出m个球(0<m≤n,m,
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020181612-60161.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020181612-55753.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020181612-55753.gif)
有
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020181612-22057.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020181612-32118.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020181613-77372.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020181613-17837.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020181613-15973.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020181614-55082.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020181614-78589.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020181606-89298.gif)
等于__________.
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020181606-49775.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020181559-24777.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020181600-84566.gif)
A.8 | B.9 | C.5 | D.6 |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020181551-37040.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020181551-21813.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020181551-82346.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020181551-78686.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020181552-51268.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020181547-55449.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020181547-10427.gif)
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