A = \left( \begin{array} { c c c } { 1 } & { 2 } & { 2 } \\ { 2 } & { – InterviewSolution

1.	A = \left( \begin{array} { c c c } { 1 } & { 2 } & { 2 } \\ { 2 } & { 1 } & { 2 } \\ { 2 } & { 2 } & { 1 } \end{array} \right) , \text { show thal } 1 ^ { 2 } - 4 \Lambda
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