Give the size of the product or state not defined. (a) a 2 3 matrix times
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(a) a 2 × 3 matrix times a 3 × 1 matrix
(b) a 1 × 12 matrix times a 12 × 1 matrix
(c) a 2 × 3 matrix times a 2 × 1 matrix
(d) a 2 × 2 matrix times a 2 × 2 matrix
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