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Multiplication of matrices.

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The matrices $A$, $B$, $C$ and $D$ are defined as:

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\\[A=\\var{A}\\qquad B=\\var{B}\\qquad C=\\var{C}\\qquad D=\\var{D}\\]

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Describe the shape of the answer matrix.

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(Recall that an $m\\times n$ matrix has $m$ rows and $n$ columns.)

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When you multiply two matrices $A$ and $B$, the answer $AB$ has the same number of rows as $A$ and the same number of columns as $B$.

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So if $A$ is an $m\\times n$ matrix and $B$ is an $n\\times p$ matrix, then $AB$ is an $m\\times p$ matrix.

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$AB:\\qquad$ [[0]]$\\times\\;$ [[1]]

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$CB:\\qquad$ [[0]]$\\times\\;$ [[1]]

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$BD:\\qquad$ [[0]]$\\times\\;$ [[1]]

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$DC:\\qquad$ [[0]]$\\times\\;$ [[1]]

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