回複：答案

來源: jinjing 於 2010-05-02 11:26:07 [] [舊帖] [給我悄悄話] 閱讀數 : (175 bytes)
回答: 用天平稱39個乒乓球 由 Blue_Diamond 於 2010-05-01 21:01:19

3+3^2+3^3+3^4+...3^n=(3^n-3)/(3-1)=.This result can be getting by induction using combining 3 to 1.The question is that 13 is not included in it.The answer may be not the Max.

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