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1 2 3 3 4. (10 points) The matrix A = 3 6 9 11 has reduced row echelon form i2 4 6 7J 1 2 3 0 rref(A) = O O 0 1 . Use this to compute a basis for the column space, a basis 0 O 0 O for the row space, and a basis for the null space of A