Question: 3. (5 points) If a 45 matrix has rank 4 , what are the dimensions of its columnspace (e.g., which of R1,R2,Rn represents the column

3. (5 points) If a 45 matrix has rank 4 , what are the dimensions of its columnspace (e.g., which of R1,R2,Rn represents the column space) and left nullspace (i.e., for a matrix Amn, the left null space is the set of all vectors x such that ATx=0)
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