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A = (\begin{matrix} 1 & 2 \\ 3 & 4 \end{matrix})

A^{- 1}

হবে -

(\begin{matrix} 3 & 1 \\ \frac{3}{2} & \frac{- 1}{2} \end{matrix})

(\begin{matrix} - 2 & - 1 \\ \frac{3}{2} & \frac{- 1}{2} \end{matrix})

(\begin{matrix} - 2 & - 1 \\ \frac{- 3}{2} & \frac{- 1}{2} \end{matrix})

(\begin{matrix} - 2 & 1 \\ \frac{3}{2} & \frac{- 1}{2} \end{matrix})

ANS : 4

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