Let $$\begin{bmatrix}1 & 0 & 0 \\4 & 1 & 0 \\16 & 4 & 1 \end{bmatrix}$$ and I be the identity matrix of order 3. If $$Q = [q_{ij}]$$ is a matrix such that $$P^{50} - Q = I$$, then $$\frac{q_{31} + q_{32}}{q_{21}}$$ equals
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