Suppose that A, B, and C are 5 x 5, 5 x 2, and 2 x 9 matrices, respectively. Determine which of the following products are defined. (a) AB (b) BA (c) AC (d) A² Answer: 5 x 9 Answer: undefined Answer: 5 x 5 Answer: 5 x 5 Note: i) For those defined, enter the size of the resulting matrix (e.g. 3 x 4 with spaces between the numbers ii) For those undefined, enter undefined.

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