组合白痴 来问个曼哈顿 模考上的问题

gys

The Carson family will purchase three used cars. There are two models of cars available, Model A and Model B, each of which is available in four colors: blue, black, red, and green. How many different combinations of three cars can the Carsons select if all the cars are to be different colors?
  24
  32
  48
  60
  192
答案： 8x6x4/3!=32    请问NN们 为什么要除以3！？

谢谢了

gys

自己要顶起来！

gys

谢谢了 马上去找！

paul_zhu

感觉就是如果三辆车不同，直接8*6*4就行了，因为你自己把这三辆车选择的时候加上了顺序，其实这三辆车没有区别，所以要把顺序除掉。