作者ooopppeeennn (open)
看板Grad-ProbAsk
标题[问题] 离散数学 好麻烦喔 还是看日剧比较好 还好有板上的大大
时间Sun Mar 22 23:40:28 2009
Let ar denote the number of ways of permuting r of the 10 letters
A, A, A, A, B, C, C, D, E, E. Find the exponential generating function
of the sequence (a0,a1,a2,...)
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