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 4 × 1, and B is 1 × 4.
A. 1 × 1; 4 × 4
B. AB does not exist; 1 × 1
C. 4 × 4; BA does not exist.
D. 4 × 4; 1 × 1
Answer: D
Mathematics
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