Posted by **mike** on Thursday, December 17, 2009 at 3:53pm.

Need to find the sizes of the product AB and the product BA whenever these exist. We are given A and B

A is 4 x 3, B is 3 x 6

- Matrices -
**MathMate**, Thursday, December 17, 2009 at 5:47pm
I assume these are the sizes of matrices.

A is 4x3 meaning that there are 4 rows and 3 columns.

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B is 3x4 meaning that there are 3 rows and 4 columns

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A matrix product is meaningful (exists) if and only if the number of columns of the first matrix equals the number of rows of the second matrix, i.e.

Apq X Bqr = Cpr

While Bqr X Apq does not exist unless r=q.

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