1.

Find the rank of the matrix A = \left( \begin{array} { c c c c } { 1 } & { 1 } & { 1 } & { 1 } \\ { 1 } & { 3 } & { - 2 } & { 1 } \\ { 2 } & { 0 } & { - 3 } & { 2 } \end{array} \right)

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