Question
$\text{If}\begin{pmatrix} 1 & 2 \\ 3 & 4 \\ \end{pmatrix}\begin{pmatrix} 3 & 1 \\ 2 & 5 \\ \end{pmatrix}=\begin{pmatrix} 7 & 11 \\ \text{k} & 23 \\ \end{pmatrix}, $then write the value of k.
✓
Answer
k = 17.
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