回複：請教解數學題。

來源: guest1000 於 2010-09-07 20:04:56 [] [舊帖] [給我悄悄話] 閱讀數 : (251 bytes)
回答: 請教解數學題。 由 灰衣人 於 2010-09-06 18:14:36

Here is the easiest way to solve the problem.

Put all 20 balls on a line. There are 19 positions between these 20 balls. If you want to put them in 4 bins without any bin being empty, the number of possibilities is (19 choose 3).

Done.

請您先登陸，再發跟帖！