If A is of order p × q and B is of order q ×r what is the order of AB and BA?
Matching exercise
Match the items on the right to the items on the left.
A is of order
B is of order
∴ Order of AB
Order of BA
p × q
q × r
p × r
not defined. (∵ No. of columns in B & no. of rows in A
are not equal.)