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1. $A = |\begin{matrix} 1 & - 4 \\ 1 & 2 \end{matrix}| ও B = |\begin{matrix} x & 0 & 0 \\ 3 & 4 & 1 \\ 2 & - 2 & 1 \end{matrix}| \begin{matrix} \end{matrix}$

A. 1
B. 1
C. 1
D. 1

Answer: Option A

Explanation:

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