find the number of ways in which 12 people can be divided into .find the number of ways in which 12 people can be divided into three groups consisting of 4,4 and 3 people with one person excluded.答案是69300

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find the number of ways in which 12 people can be divided into .find the number of ways in which 12 people can be divided into three groups consisting of 4,4 and 3 people with one person excluded.答案是69300
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find the number of ways in which 12 people can be divided into .find the number of ways in which 12 people can be divided into three groups consisting of 4,4 and 3 people with one person excluded.答案是69300
find the number of ways in which 12 people can be divided into .
find the number of ways in which 12 people can be divided into three groups consisting of 4,4 and 3 people with one person excluded.
答案是69300

find the number of ways in which 12 people can be divided into .find the number of ways in which 12 people can be divided into three groups consisting of 4,4 and 3 people with one person excluded.答案是69300
从12个人里面选4个人放在一组:12C4 = 495 种 
从剩下的8个人里面选4个人放在一组:8C4 = 70 种 
从剩下的4个人里面选3个人放一组:4C3 = 4 种 
一个人被排除在外的选法有:12 种 



总共方法数为 495 x 70 x 4 x 12 / 4! = 69300 

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