The sum of the eigen values of the matrix given below...

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The sum of the eigen values of the matrix given below is \[\left[ {\begin{array}{*{20}{c}} 1&2&3 \\ 1&5&1 \\ 3&1&1 \end{array}} \right].\]

A. 5

B. 7

C. 9

D. 18

Answer: Option B

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