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2. Prove by induction: (a) i=1ni=n(n+1)/2,n1 (b) i=1ni2=n(n+1)(2n+1)/6,n1 (c) i=0nxi=(xn+11)/(x1),x=1,n0
2. Prove by induction: (a) i=1ni=n(n+1)/2,n1 (b) i=1ni2=n(n+1)(2n+1)/6,n1 (c) i=0nxi=(xn+11)/(x1),x=1,n0
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