Prove,by inducation,that for all positive integers n.
(n)(1)+(n-1)(2)+(n-2)(3)+...+(n -2)(3)+(n-1)(2)+(n)(1) =(1/6)(k)(k+1)(k+2)
maths........
2008-09-06 3:01 am
回答 (3)
2008-09-07 3:20 pm
2008-09-06 5:02 am
http://hk.knowledge.yahoo.com/question/question?qid=7008050501024
Think twice before you answer this question.
Think twice before you answer this question.
2008-09-06 3:31 am
..............出錯題................
左邊n點等於右邊k?
左邊n點等於右邊k?
收錄日期: 2021-04-23 20:33:46
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https://hk.answers.yahoo.com/question/index?qid=20080905000051KK01595