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Determinantsmedium
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Given A=(123045006)A = \begin{pmatrix} 1 & 2 & 3 \\ 0 & 4 & 5 \\ 0 & 0 & 6 \end{pmatrix}A=​100​240​356​​, what is the entry (A−1)33(A^{-1})_{33}(A−1)33​?