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The minimum eigen value of the following matrix is
\[\left[ {\begin{array}{*{20}{c}} 3&5&2 \\ 5&{12}&7 \\ 2&7&5 \end{array}} \right]\]

B. 1

C. 2

D. 3

Answer: Option A

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How many of the following matrices have an eigen value 1?
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