48X15!

来源: wxcfan123 于 2014-01-04 12:21:55 [] [旧帖] [给我悄悄话] 阅读数 : (280 bytes)
回答: 高中数学题：求和 由 万斤油 于 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.

所有跟帖： 

• 正确，思路很妙，多谢！ -万斤油- ♂ 给 万斤油 发送悄悄话 (0 bytes) () 01/04/2014 postreply 19:21:53

请您先登陆，再发跟帖！