12. Find the dimension of the column space of A where $$ A = begin{bmatrix} 1 &...

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12. Find the dimension of the column space of A where

$$

A = \begin{bmatrix}

1 & 1 & 1 \\

2 & 2 & 2 \\

-1 & 1 & -3 \\

1 & 2 & 0

\end{bmatrix}

$$

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