[理工] [離散] 指數生成函數
A ship carries 48 flags,12 each of the colors red,white,blue,and black.
Twelve of these flags are placed on a vertical pole in order to communicate
a signal to other ships.How many of these signals use an even number of blue
flags and an odd number of black flags?
A(x)={(e^x+e^-x)/2}{(e^x-e^-x)/2}e^xe^x
式子這樣列對嗎?
最後化簡完答案會是多少,可以幫我算一下嗎
謝謝
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