What is the result of the matrix sum (13)+(42)\begin{pmatrix} 1 & 3 \end{pmatrix} + \begin{pmatrix} 4 & 2 \end{pmatrix}(13)+(42)?
(55)\begin{pmatrix} 5 & 5 \end{pmatrix}(55)
(55)\begin{pmatrix} 5 \\ 5 \end{pmatrix}(55)
(46)\begin{pmatrix} 4 & 6 \end{pmatrix}(46)
Undefined