请教prep李面一道题。。。

jasonlover

43.A committee of three people is to be chosen from four married couples.What is the number of different committees that can be chosen if two people who are married to each other cannot both serve on the committee?

legnawen

第一次从8个人中任取一个，第二次选取时第一次被取走的那个人的老公或老婆就不能取了，只能6个人中取一个，第三次选取时同理只能4个人中取一个，所以共有8*6*4种committees组合，对吧~

sunflower88

同上！

jasonlover

豁然开朗
谢谢2楼G友乐~~
开始一直搞不懂6怎么来的

友情提醒：
不过， 答案还要除以3！，因为有重复的