The sizes of two matrices A and B are given. Find the sizes of the product AB and the product BA, whenever these products exist.A is 2 × 1, and B is 1 × 2.
A. 2 × 2; 1 × 1
B. 1 × 1; 2 × 2
C. AB does not exist; 1 × 1
D. 2 × 2; BA does not exist.
Answer: A
Mathematics
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