Matrix A shows the orders of 2 clients for 3 products (order 2 × 3). Matrix B shows the units of 4 raw materials needed for each product (order 3 × 4). Which matrix gives the raw material each client's order needs?
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Hint
The columns of the first matrix must equal the rows of the second.
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Answer: D. AB, of order 2 × 4
AB is defined because A has 3 columns and B has 3 rows. Its order is 2 × 4: one row for each client and one column for each raw material.