The sizes of two matrices are given. Find the size of the product AB and the size of the product BA, if the given product can be calculated.A is 2 × 1; B is 1 × 1.
A. AB is 2 × 2; BA is 1 × 1.
B. AB cannot be calculated; BA is 1 × 2.
C. AB is 2 × 1; BA cannot be calculated.
D. AB is 1 × 2; BA is 1 × 1.
Answer: C
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