# Matrix multiplication question

1. Oct 6, 2007

### tomcenjerrym

What is $$\left(\begin{array}{ccc}1&1&2\\0&2&1\\1&0&3\end{array}\right)\left(\begin{array}{cc}1&1\\3&3\end{array}\right)?$$
I'm so confuse because the first matrix is 3 columns matrix and the second matrix is 2 rows matrix. Thank you

2. Oct 6, 2007

### D H

Staff Emeritus
The product of a 3x3 matrix and a 2x2 matrix is undefined. The number of columns in the first matrix must equal the number of rows in the second matrix.