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6. For each of the following matrices, use its rank to determine whether it is invertible. 1 0 2 -5 1 4 2 1

6. For each of the following matrices, use its rank to determine whether it is invertible. 1 0 2 -5 1 4 2 1 2 A = -5 C = -2 4 -2 -3 1 -2 1 0 8. -2 -1 1 -1 0 0

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