Consider the following Gauss elimination: Го 1 1. 1 0 3 T2 -3 -9 0 EA → |0 9 0 E2EA→ 0 1 0 E3 E2E¡A = | 0 0 1 | 1 0 |A → 0 1 4 1 0 0 1 4 E What is the determinant of A? det(A) =

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