[理工] 工程機率
In how many ways can we give 6 different gifts to 4 students
and each of them get at least one gift .
講義詳解:
4^6-{4C3*[3^6-3C2*2^6]+4C2*[2^6-2]+4C1*1}=1566
我的想法:
(1,1,1,3)=>4!/3!*{6C1*5C1*4C1*3C3}
(1,1,2,2)=>4!/(2!2!)*{6C1*5C1*4C2*2C2}=1560...
請問各位大大 是哪邊出了問題了呢@@?
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