作者ooopppeeennn (open)
看板Grad-ProbAsk
標題[問題] 離散數學!
時間Sun Mar 22 22:23:14 2009
1.Find the mumber of n-digit words generated from the alphabet {0,1,2,3}
in each of which the number of 0's is even .
2.Find the exponential generating function of the sequence
(1,1*4,1*4*7,1*4*7*...*(3r+1),...).
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