- 95

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## Main Question or Discussion Point

simple matrix question

For Matrix A; size (3 x 1)

Matrix B; size (1 x 3)

AB = (3 x 3)

But when does matrix multiplication not work?

For Matrix A; size (3 x 1)

Matrix B; size (1 x 3)

AB = (3 x 3)

But when does matrix multiplication not work?