looks like an empty set to me
suspect so
If both set x and set y have no numbers in common does x∩y become a blank set written as { }?
2 answers
As in X = {13,4,5,6} and Y = {2,11,24,7}
They have no elements/numbers in common so X∩Y = { }.
They have no elements/numbers in common so X∩Y = { }.