Either the Dimensions of Two Matrices or the Matrices Themselves $\mathrm { A }$

question 83

Multiple Choice

Either the dimensions of two matrices or the matrices themselves are given. Find the dimensions of the product AB and
the product BA. If either is not defined, say so.
- $\mathrm { A }$ is $2 \times 1$ ; B is $1 \times 1$ .

• A) \(\mathrm { AB }\) is \(2 \times 2\); BA is \(1 \times 1\).
• B) \(\mathrm { AB }\) is not defined; \(\mathrm { BA }\) is \(1 \times 2\).
• C) \(\mathrm { AB }\) is \(2 \times 1\); \(\mathrm { BA }\) is not defined.
• D) \(\mathrm { AB }\) is \(1 \times 2\); \(\mathrm { BA }\) is \(1 \times 1\).

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Endorse

To give support or approval to something or someone, often by writing a signature on a document to authorize its validity or transfer.