If A = set of whole numbers and B = set of natural numbers, then the set of elements belonging to A and B is _____ .
phi
{phi}
A
B
If A = Set of whole numbers and B = Set of natural numbers, then A - B = ___.
If A = {set of whole numbers < 5} and B = {set of natural numbers < 6}, then A and B are________.
If A = {set of th first four natural numbers} and B = {set of the first four whole numbers}, then sets A and B are _______.