[問題] 離散數學 好麻煩喔 還是看日劇比較好 還好有板上的大大
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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