1.
Let P=(100310931)P = \begin{pmatrix} 1 & 0 & 0 \\ 3 & 1 & 0 \\ 9 & 3 & 1 \end{pmatrix} and Q=[qij]Q = [q_{ij}] be two 3×33 \times 3 matrices such that QP5=I3Q - P^{5} = I_{3}. Then q21+q31+q32q_{21} + q_{31} + q_{32} is equal to: