The Sizes of Two Matrices a and B Are Given $4 \times 4$

question 71

Multiple Choice

The sizes of two matrices A and B are given. Find the sizes of the product AB and the product BA, if the products are
defined.
-A is $4 \times 4$ , B is $4 \times 4$ .

• A) \(\mathrm { AB }\) is \(8 \times 4\), BA is \(8 \times 4\).
• B) \(\mathrm { AB }\) is \(4 \times 4\), BA is \(4 \times 4\).
• C) \(\mathrm { AB }\) is \(4 \times 8\), BA is \(4 \times 8\).
• D) \(\mathrm { AB }\) is \(1 \times 1\), BA is \(1 \times 1\).

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