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2. Let A be of dimension 3 × 4, B be of dimension 3 × 3,...

2. Let A be of dimension 3 × 4, B be of dimension 3 × 3, C be of dimension 2 × 3, and D be of dimension 3 × 2. Determine which of the following calculations are possible. If they are, give the dimensions. If not, explain why not.

(a) (BA)C

b) CD + BA

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