6. Shown below are matrix A and its rref, R. A = b. Find nullity (AT). 3 -6 0 1 1 5 01 00 000 2 -4 1 21 оло a. Find a basis for the column space of A. R = 1 0 -0 0 1 3 3 2 2 0 0 1 5 5 0001 -1 1

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