Let R be a binary relation on A={1,2,3,43 defined a is related with b) if a²-b² is divisble by 3. aRb (1.c., by Determine whether (4,2) ER. Show your work. Give a pair (a, b) of natural numbers in A such that (a,b) & R. Explain your answer O Determine whether R is reflexive or not. If so, prove it, if not give a counter example.