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Matrix multiplication question

  1. Oct 6, 2007 #1
    What is [tex]\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)?[/tex]
    I'm so confuse because the first matrix is 3 columns matrix and the second matrix is 2 rows matrix. Thank you
  2. jcsd
  3. Oct 6, 2007 #2

    D H

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    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.
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