Ononot — Starting with matrix A where \det(A) = 4, we perform three o

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Determinantsmedium

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Starting with matrix $A$ where $\det(A) = 4$ , we perform three operations in sequence: (1) Multiply row 1 by 3, (2) Add row 2 to row 3, (3) Swap rows 1 and 2. Let $B$ be the resulting matrix. What is $\det(B)$ ?