The Sizes of Two Matrices a and B Are Given $A$

question 39

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 $1 \times 4 , B$ is $4 \times 1$ .

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

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