设 $\boldsymbol{a}=\left(\begin{array}{r}2 \\ 1 \\ -3\end{array}\right), \boldsymbol{b}=\left(\begin{array}{l}1 \\ 2 \\ 4\end{array}\right), \boldsymbol{A}=\boldsymbol{a} \boldsymbol{b}^{\mathrm{T}}$, 求 $\boldsymbol{A}^{100}$.
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