If A, B are, respectively m × n, k × l matrices, then both AB and BA are defined if and only if
m = l , n= l
n = k and l = m
n = m , k = m
m=n, k = l
The correct option is
B
AB and BA are defined if and only if
n=k and l=m
If A is a matrix of order m x n and B is a matrix of order l x p. The product AB of two matrices is defined if,