Problem:
Compute the rank of
$\left(
\begin{array}{cc}
 \frac{44}{7} & \frac{69}{7} \\
 -\frac{47}{7} & \frac{43}{7} \\
\end{array}
\right)$.
Answer:
$2$
{'source': 'AMPS', 'file': 'amps/mathematica/linear_algebra/rank_and_nullity/26521.txt'}