Everything Can Be Cancelled Off?
Algebra
Level
3
\[ \large i + i^2 + i^3 + i^4 + \cdots + i^n = - 1 \]
The equation above holds true for some positive integer \(n\). Which of the following is a possible value of \(n\)?
Clarification: \(i=\sqrt{-1}\).
by
Chung Kevin