来自卢震宇的问题
6本不同的书分给4个学生每人至少1本?有多少种分法?的
6本不同的书分给4个学生每人至少1本?有多少种分法?
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2020-03-26 14:04
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知识点：排列组合要做到分书,有两类分堆情况为1,1,1,3或者1,1,2,2对于第一种情况,先选出3本,有C(6,3）种,和另外3本一起分别送给4人,这样就有C(6,3)*A(4,4)种对于第二种情况,先把2本,2本的选出,有C(6,2)*C(4,2)*...
2020-03-26 14:06:15
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