If \( A=\left[\begin{array}{rrr}1 & -5 & 7 \\ 0 & 7 & 9 \\ 11 & 8 & 9\end{array}\right] \), then...
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If \( A=\left[\begin{array}{rrr}1 & -5 & 7 \\ 0 & 7 & 9 \\ 11 & 8 & 9\end{array}\right] \), then trace of matrix \( A \), is
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