What is the result of adding the rows of (1234)\begin{pmatrix} 1 & 2 \\ 3 & 4 \end{pmatrix}(1324)?
(4634)\begin{pmatrix} 4 & 6 \\ 3 & 4 \end{pmatrix}(4364)
(1246)\begin{pmatrix} 1 & 2 \\ 4 & 6 \end{pmatrix}(1426)
(4646)\begin{pmatrix} 4 & 6 \\ 4 & 6 \end{pmatrix}(4466)
(2434)\begin{pmatrix} 2 & 4 \\ 3 & 4 \end{pmatrix}(2344)