Prove:
1) n*n-1Cr = (r+1)*nCr+1
2) n-1Cr-1 + n-1Cr = nCr
3) 100! = 2^50 (1*3*5*...*99)*50!
M2 的數學的問題 (20點!)
2010-01-05 3:02 am
回答 (1)
2010-01-05 7:54 am
收錄日期: 2021-04-22 00:46:30
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100104000051KK01178