The value of sum

MATHEMATICS · Single correct · CBSE · Mathematics · Complex Numbers and Quadratic Equations · Complex Numbers and Quadratic Equations

Problem

The value of sum

\sum_{n=1}^{13} (i^n + i^{n+1})

, where

i = \sqrt{-1}

, equals (A)

i

(B)

i-1

(C)

-i

(D) 0

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