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  4. The order of the single matrix obtained from [1&-1 0&2 2&3] beginBmatrix[-1&0&2 2&0&1] - [0&1&23 1&0&21] endBmatrix is

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Q. The order of the single matrix obtained from
$\begin{bmatrix}1&-1\\ 0&2\\ 2&3\end{bmatrix} \begin{Bmatrix}\begin{bmatrix}-1&0&2\\ 2&0&1\end{bmatrix} - \begin{bmatrix}0&1&23\\ 1&0&21\end{bmatrix}\end{Bmatrix}$ is

Matrices

Solution:

When a $3 \times2$ matrix is post multiplied by a$ 2\times 3$ matrix, the product is a $3 \times 3$ matrix.