Re: [問題] 離散數學 好麻煩喔 還是看日劇比較好 …
※ 引述《ooopppeeennn (open)》之銘言：
: 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,...)
A(X) = Σan x^n
等同是從4個相異物取R個作排列
A:(1+X/1!+X^2/2!+X^3/3!+X^4/4!)
B:(1+X/1!)
C:(1+X/1!+X^2/2!)
D:(1+X/1!)
E:(1+X/1!+X^2/2!)
an = 上述相乘 (應該是close form了吧!)
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