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# The conjugate of $i^{13}+i^{14}+i^{15}+i^{16}$ is

$\begin{array}{1 1}(1)1&(2)-1\\(3)0&(4)-i\end{array}$

$i^n+i^{n+1}+i^{n+2}+i^{n+3}=0$
$i^{13}+i^{14}+i^{15}+i^{16}=0$
The conjugate of 0 is 0.