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Determinantsmedium
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Use cofactor expansion along the first row to find det⁡(B)\det(B)det(B) where B=(123045006)B = \begin{pmatrix} 1 & 2 & 3 \\ 0 & 4 & 5 \\ 0 & 0 & 6 \end{pmatrix}B=​100​240​356​​.