The dimensions of two matrices are given. Find the dimensions of the product AB and the product BA. If either is not defined, say so.A is 2 × 1; B is 1 × 1.
A. AB is 2 × 2; BA is 1 × 1.
B. AB is 2 × 1; BA is not defined.
C. AB is 1 × 2; BA is 1 × 1.
D. AB is not defined; BA is 1 × 2.
Answer: B
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