Compute the products AB and BA whichever exists in each of the following cases:
and 
here 
since the order of A is 1
4 and order of B is 4
,
AB and BA both exit and order of AB = 1
and order of BA = 4
Hence
3
Compute the products AB and BA whichever exists in each of the following cases:
and
here
since the order of A is 14 and order of B is 4,
AB and BA both exit and order of AB = 1 and order of BA = 4
Hence