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Matriceshard
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For a 3×33 \times 33×3 matrix AAA, if adj(A)=(100010001)\text{adj}(A) = \begin{pmatrix} 1 & 0 & 0 \\ 0 & 1 & 0 \\ 0 & 0 & 1 \end{pmatrix}adj(A)=​100​010​001​​, what is AAA?