Answer:
AB = 2 x 2
BA = 1 x 1
Explanation:
If we have two matrices with sizes:
a x b and n x m,
The product will exist if b = n and the result will have a rows and m columns or will have a size of a x m.
Therefore, for the matrices, A = 2 x 1 and B = 1 x 2:
The product AB exists and the size of the product is 2 x 2.
The product BA exists and the size of the product is 1 x 1.
