1. $\begin{array}{l}\text {} A=\left[\begin{array}{ll}5 & 2 \\ 2 & 1\end{array}\right], B=\left[\begin{array}{rr}3 & -2 \\ -4 & 3\end{array}\right], C=\left[\begin{array}{lll}1 & 3 & 2 \\ 2 & 1 & 3 \\ 3 & 2 & 1\end{array}\right], X=\left[\begin{array}{l}x \\ y \\ z\end{array}\right] \\ \text { এবং } R=\left[\begin{array}{l}5 \\ 1 \\ 4\end{array}\right]\end{array}$