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CBSE Class 10 Answered

Find the sum of all terms given in a sequence 1,2+x,3+x^2,4+x^3,...,n+x^(n-1)
Asked by kajari ashtaputre | 13 Feb, 2012, 05:54: PM
answered-by-expert Expert Answer
Sum = 1 + 2 + x + 3 + x2 + ......
= (1+2+3+ ......+n) + (x + x2 + .....+xn-1)
= n(n+1)/2 + x(xn - 1)/(x-1)
Answered by | 14 Feb, 2012, 07:23: PM

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