如标题, 求解法。
由此想出一题:7位数共有15种分类方法(几对或几头), 10位数呢?n位数呢?
所有跟帖:
• partition number -aisanguo- ♀ (485 bytes) () 04/15/2012 postreply 20:57:39
• THX.OK,original Qs are about permutatios.The paper is not very u -jinjing- ♀ (207 bytes) () 04/16/2012 postreply 10:36:55