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For example if you are multiplying a 2x4 matrix by a 3x9 is it considered as undefined? 

 Sep 1, 2019
 #1
avatar+6192 
+3

\(\text{An $m\times k$ matrix may multiply a $k \times n$ matrix to produce a $m \times n$ matrix}\)

 

The example you gave is undefined.

 Sep 1, 2019
edited by Rom  Sep 2, 2019
edited by Rom  Sep 2, 2019
 #2
avatar+684 
+1

thank you so much!! 

Nirvana  Sep 1, 2019

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