MathDB
2013 HMMT Algebra #9: Sum of Complex Numbers

Source:

February 17, 2013
HMMTAMCAIME

Problem Statement

Let zz be a non-real complex number with z23=1z^{23}=1. Compute k=02211+zk+z2k.\sum_{k=0}^{22}\dfrac{1}{1+z^k+z^{2k}}.