Answer
Fill the blanks with
... m ... p ... columns ... rows ...
Work Step by Step
See p.618, Matrix Multiplication:
The product of an $m\times n$ matrix $A$ and an $n\times p$ matrix $B$ is an $m\times p$ matrix $AB$.
n= number of columns in A = number of rows in B.
Fill the blanks with
... m ... p ... columns ... rows ...
