Practice problem
Select the products that exist. A=[6801] B=[4361] C=[57] D=[82]A=\begin{bmatrix}6&8\\0&1\end{bmatrix}\,B=\begin{bmatrix}4&3\\6&1\end{bmatrix}\,C=\begin{bmatrix}5\\7\end{bmatrix}\,D=\begin{bmatrix}8&2\end{bmatrix}A=[6081]B=[4631]C=[57]D=[82]
ABABAB
ACACAC
ADADAD
BCBCBC
BDBDBD
CDCDCD
Type a concept, like “slope” or “photosynthesis”.
