The product of two 2x3 matrices A2x3 and B2x3 is?

Question

a 4x9 matrix
undefined
a 4x3 matrix
a 2x3 matrix
a number
a 2x9 matrix

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Answer 1 · 2017-10-13T13:55:24

Undefined.

For matrix multiplication #AB#, the number of columns of A must be equal to the number of rows of B.

A has 3 columns and B has 2 rows, so they are not compatible for multiplication.