The product of the two matrices is found by multiplying the components from the columns of the first matrix by the components in the rows of the second matrix and then adding those products, then the number of columns in the first matrix must equal to the number of rows in the second matrix.

The product of the two matrices is found by multiplying the components from the columns of the first matrix by the components in the rows of the second matrix and then adding those products, then the number of columns in the first matrix must equal to the number of rows in the second matrix.

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