F4 binomial expandsion問題一條

2009-09-22 3:56 am
Prove that n.n-1 C r=(r+1).n C r+1
.=乘號
include the solution please :)

回答 (1)

2009-09-22 5:09 am
✔ 最佳答案
As follows:

圖片參考:http://h.imagehost.org/0460/ScreenHunter_05_Sep_21_21_06.gif


收錄日期: 2021-04-13 16:51:44
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090921000051KK01464

檢視 Wayback Machine 備份