Problem:
Compute the trace of
$\left(
\begin{array}{cccc}
 \frac{67}{7} & -\frac{40}{7} & \frac{27}{7} & -\frac{51}{7} \\
 -3 & \frac{54}{7} & \frac{15}{7} & -\frac{59}{7} \\
 -\frac{47}{7} & \frac{67}{7} & \frac{9}{7} & 2 \\
 0 & \frac{8}{7} & 6 & \frac{38}{7} \\
\end{array}
\right)$.
Answer:
$24$
{'source': 'AMPS', 'file': 'amps/mathematica/linear_algebra/trace/25123.txt'}