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The eigen values of the matrix $\left[\begin{array}{rrrr}2 & -1 & 0 & 0 \\ 0 & 3 & 0 & 0 \\ 0 & 0 & -2 & 0 \\ 0 & 0 & -1 & 4\end{array}\right]$ are

  1. $2,-2,1,-1$
  2. $2, 3, -2, 4$
  3. $2,3,1,4$
  4. None of these
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