C(6,3)=20,他後麵又乘了3,包含你說的情況
回答: 比如 在 C(6,2) 情況, 1,1,2,3, 1,2,2,3, 1,2,3,3, 等都被隻認為一種Combination,
由 smallking
於 2012-12-28 20:48:24
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