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Let A = -1 4-9 2 2 3 (a) (15 points) Find det(A), and det (2A). (b) (10 points) Find det(A), by reducing A

Let A = -1 4-9 2 2 3 (a) (15 points) Find det(A), and det (2A). (b) (10 points) Find det(A), by reducing A into a triangular mat

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