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[\begin{matrix} 1 & 2 & 1 \\ 0 & 1 & - 1 \\ 3 & - 1 & 1 \end{matrix}] [\begin{matrix} 1 & 2 & 1 \\ 0 & 1 & - 1 \\ 3 & - 1 & 1 \end{matrix}] = [\begin{matrix} 4 & 3 & 1 \\ - 3 & 1 & - 2 \\ 6 & x & 5 \end{matrix}]

হলে x=কত ?

-2

-4

ANS : 4

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