作者ayanami (时光飞逝)
看板GRE_Verbal
标题[数学] 请教排列组合问题
时间Sat Aug 18 00:02:42 2007
做pp3做到的：
Seven one-dollar bills are to be distributed among A, B, C(人名省略)
so that each person recieves at least $1.
A. The number of ways to distribute the bills so that at least
one person recieves at least $3.
B. The total number of ways to distribute the bills.
Ans: C (equal)
麻烦了，有劳众高手...orz
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