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A = [\begin{matrix} 1 & 0 & 0 \\ 0 & 1 & 0 \\ 0 & 0 & 1 \end{matrix}]

হলে, কোনটি সত্য?

A^{2} - 4 A

A^{2} = 3 A

A^{2} = 2 A

A^{2} = A

ANS : 4

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