48X15!

來源: wxcfan123 於 2014-01-04 12:21:55 [] [舊帖] [給我悄悄話] 閱讀數 : (280 bytes)
回答: 高中數學題：求和 由 萬斤油 於 2014-01-03 21:01:58

Set a map: P(n) = 16 - n (n= 1, 2, ... 15), and P(M) = {P(a11), P(a12), ...} for all 5x3 tables.

{P(M): M} is an rearrangement of the original 15! tables.

Consider table M and P(M), the smallest row becomes the largest row, and the sum is 48.

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• 正確，思路很妙，多謝！ -萬斤油- ♂ 給 萬斤油 發送悄悄話 (0 bytes) () 01/04/2014 postreply 19:21:53

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