prove n C r = (n-1)C r + (n-1) C (r-1)
using (1+x)^n=(1+x)^(n-1)times(1+x) where ^ means 'to the power'
F6 pure mathe
2008-09-09 9:28 pm
回答 (1)
2008-09-09 10:07 pm
✔ 最佳答案
The answer is as follows:圖片參考：http://i277.photobucket.com/albums/kk75/uncle_michael/080909_mat_2.jpg?t=1220940410
收錄日期: 2021-04-23 23:05:16
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https://hk.answers.yahoo.com/question/index?qid=20080909000051KK00726