13. If A is a 3 × 5 matrix, B is a 5 × 7 matrix, Cis a 7 × 11 matrix, Dis a 5 × 7 matrix, which of the following matrix products are defined? Give the size of each answer if it is defined. ( a) A × B × C ( b) B × C × D ( c) A × D × C ( d) A × B × D | |
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