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 1 × 2, and B is 2 × 1.
A. 1 × 1; BA does not exist.
B. 1 × 1; 2 × 2
C. 2 × 2; 1 × 1
D. AB does not exist; 2 × 2
Answer: B
Mathematics
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