The sum of Eigen values of the matrix, $[M]$ is

where $[M] = \begin{bmatrix} 215 & 650 & 795 \\ 655 & 150 & 835 \\ 485 & 355 & 550 \end{bmatrix}$

1. $915$
2. $1355$
3. $1640$
4. $2180$
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