Is this matrix multiplication is possible? Microsoft mathematics gives me an answer for it? How it could be a correct? If we need multiple two matrix, number of rows and columns should be equal. So how it is possible?
$$\begin{bmatrix} 3 \\ 2 \\ 1 \\ \end{bmatrix}\begin{bmatrix} 1 & 2 & 3 \\ \end{bmatrix}$$