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If $${\left[ {1,\,0,\, - 1} \right]^{\text{T}}}$$ is an eigen vector of the following matrix \[\left[ {\begin{array}{*{20}{c}} 1&{ - 1}&0 \\ { - 1}&2&{ - 1} \\ 0&{ - 1}&1 \end{array}} \right]\] then corresponding eigen value is

A. 1

B. 2

C. 3

D. 5

Answer: Option A

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