\begin{pmatrix}
P_A(i) \\
P_B(i) \\
\end{pmatrix}
=
\begin{pmatrix}\frac{4}{5} - \frac{4 \left(- \frac{1}{4}\right)^{i}}{5}\\\frac{4 \left(- \frac{1}{4}\right)^{i}}{5} + \frac{1}{5}\end{pmatrix}
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