[理工] [離散]-排列組合
題目： Consider the 2^19 compositions of 20.
(a) How many have each summamd even??
(b) How many have each summamd a multiple of 4??
解答： (a) 2^9 (b) 2^4
想法： 不太懂題目的意思~是2^19可以被多少個20給建構的意思嗎??
可是20並沒有辦法整除2^19，所以這個作法應該是錯的...
I have no idea... 希望板上的各位先進們給予指教~
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