$\"\"$

The operation of the matrix expression is $\"\"$ .

Multiplication of two matrices possible if the number of columns in the first matrix equals the number of rows in the second matrix.

The dimensions of the matrix $\"\"$ are $\"\"$ and the number of columns in the matrix is $\"\"$ .

The dimensions of the matrix $\"\"$ are $\"\"$ and the number of the rows in the matrix is $\"\"$ .

The number of columns in the matrix $\"\"$ equals the number of rows in the

matrix $\"\"$ .

So, matrix product $\"\"$ is possible.

Its dimensions are $\"\"$ .

$\"\"$ . $\"\"$

The matrix product $\"\"$ is defined and matrix $\"\"$ dimensions are $\"\"$ .