prove the following proposition are true for all positive integers
1x N + 2 x (N-1) + 3 x (N-2) +...+(N-1) x 2 + N x 1=[ N(N+1)(N+2) ] / 6
mathematical induction
2010-09-07 5:44 am
回答 (1)
2010-09-07 5:47 am
收錄日期: 2021-04-22 00:53:02
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https://hk.answers.yahoo.com/question/index?qid=20100906000051KK01501