[理工] [機率]-排列組合
In how many ways can we give 6 differernt gifts to 4
students and each of them get at least one gift.
4 3 4 4
ans:4^6-{C *[3^6-C *2^6]+C *[2^6-2]+C *1}
3 2 2 1
應該還有別的方式解,不過就是想不出來..
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07/21 17:18, , 1F
07/21 17:18, 1F
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