- #1

TheoEndre

- 42

- 3

## Homework Statement

##\sum_{n=1}^{\infty }1+(-1)^{n+1} i^{2n}##

Is this series divergent or convergent?

## Homework Equations

3. The Attempt at a Solution [/B]

I tried using the divergent test by taking the limit as ##n## approaches ##{\infty }##, but both ##i^{2n}## and ##(-1)^{n+1}## will alternate from ##-1## to ##1##, while when I write the first terms, I get ##0## and that's what made me confused.