Problem:
Compute the (pseudo)inverse of
$\left(
\begin{array}{cc}
 1 & \frac{1}{4} \\
 \frac{3}{4} & 5 \\
\end{array}
\right)$.
Answer:
$\left(
\begin{array}{cc}
 \frac{80}{77} & -\frac{4}{77} \\
 -\frac{12}{77} & \frac{16}{77} \\
\end{array}
\right)$
{'source': 'AMPS', 'file': 'amps/mathematica/linear_algebra/pseudoinverse/48317.txt'}