The product $AB$ of two matrices is defined only when:
AA and B have the same order
Bboth are square
CA and B are symmetric
Dthe number of columns of $A$ equals the number of rows of $B$
Answer & Solution
Correct answer: D. the number of columns of $A$ equals the number of rows of $B$
AB is defined only when columns of A = rows of B (inner dimensions match).
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