Ononot — Given a 3 \times 3 matrix A where A{ij} = (-1)^{i+j} \cdot 2

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Determinantshard

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Given a $3 \times 3$ matrix $A$ where $A_{ij} = (-1)^{i+j} \cdot 2^{i-j}$ , what is the value of $\det(A)$ ?