Prove each of the following by mathematical induction,where n is a
natural number.
1. １．２．３＋２．３．４＋３．４．５＋.....+n(n+1)(n+2)=1/4 n(n+1)(n+2)(n+3)
2. 2+2^2+2^3+......+2^n=2^n+1 -2
A.MATHS
2008-09-08 12:18 am
回答 (1)
2008-09-08 12:47 am
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