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Let A be a 3 x 8, B be a 8 x 7 and C be a 7 x 3 matrix. Determine the size

Let A be a 3 x 8, B be a 8 x 7 and C be a 7 x 3 matrix. Determine the size of the following matrices (if they do not exist, type N in both answer boxes): ATB BC: X ABC: BCT: x X

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