GATE 2017 · CS2 - Afternoon
Let P = \[\begin{bmatrix}1 & 1 & -1\\2 & -3 & 4\\3 & -2 & 3\end{bmatrix}\] and Q = \[\begin{bmatrix}-1 & -2 & -1\\6 & 12 & 6\\5 & 10 & 5\end{bmatrix}\]. Then the rank of P + Q is _______
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