- #1
lionely
- 576
- 2
Homework Statement
Sum the series 1 + 2a + 3a2 + ... to n terms
This series consists of an a.p. (with general term n) and gp general term a^(n-1)
right?
So the series general term is na^(n-1)
So is the sum the sum of each progression times each other?
i.e (1-a^n)/(1-a) * (n(n+1)/2) ?