Question

if A={1,2,3} B={2,3,4} THEN
a)A×B=B×A
b)A×B=0
C)A×B≠B×A
d)(A×B)∩(B×A)≠0

Answer 1

c) and d) both are correct.

A X B  ≠ B X A   as   there are different elements in them: 1 , 4...

A X B ∩  B X A  =  { (2,2) , (3,3) } ≠ ∅