C(6,3)=20,他后面又乘了3,包含你说的情况
回答: 比如 在 C(6,2) 情况, 1,1,2,3, 1,2,2,3, 1,2,3,3, 等都被只认为一种Combination,
由 smallking
于 2012-12-28 20:48:24
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