Problem:
Compute the trace of
$\left(
\begin{array}{ccc}
 -\frac{6}{e} & -\frac{16}{e} & -\frac{21}{e} \\
 -\frac{15}{e} & 0 & \frac{24}{e} \\
 -\frac{27}{e} & \frac{5}{e} & -\frac{20}{e} \\
\end{array}
\right)$.
Answer:
$-\frac{26}{e}$
{'source': 'AMPS', 'file': 'amps/mathematica/linear_algebra/trace/40017.txt'}