Problem:
Multiply
$\left(
\begin{array}{cccc}
 0 & 2 & 1 & -2 \\
\end{array}
\right)$ and
$\left(
\begin{array}{cc}
 1 & 1 \\
 1 & 2 \\
 1 & 1 \\
 1 & -1 \\
\end{array}
\right)$.
Answer:
$\left(
\begin{array}{cc}
 1 & 7 \\
\end{array}
\right)$
{'source': 'AMPS', 'file': 'amps/mathematica/linear_algebra/multiply/27519.txt'}