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.A is 3 × 1; B is 1 × 3.
A. AB is not defined; BA is 1 × 1.
B. AB is 3 × 3; BA is 1 × 1.
C. AB is 1 × 1; BA is 3 × 3.
D. AB is 3 × 3; BA is not defined.
Answer: B
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