Question
Mon February 13, 2012 By: Kajari Ashtaputre

Find the sum of all terms given in a sequence 1,2+x,3+x^2,4+x^3,...,n+x^(n-1)

Expert Reply
Tue February 14, 2012
Sum = 1 + 2 + x + 3 + x2 + ......
= (1+2+3+ ......+n) + (x + x2 + .....+xn-1)
= n(n+1)/2 + x(xn - 1)/(x-1)
Ask the Expert