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6- If a 7 x 5 matrix A has rank 2, find dim Nul A, dim Row 4, and rank AT. 7- Suppose a 6

6- If a 7 x 5 matrix A has rank 2, find dim Nul A, dim Row 4, and rank AT. 7- Suppose a 6 x 8 matrix A has four pivot columns. What is dim Nul A

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