A matrix with m rows and n columns is said to be of type m n.
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A matrix with m rows and n columns is said to be of type m × n. Give simple examples of matrices A and B to illustrate the following situations:
(a) AB is defined but BA is not;
(b) AB and BA are both defined but have different type;
(c) AB and BA are both defined and have the same type but are unequal.
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