For questions 3‒4, let X = {x | x is a whole number less than 15}, Y = { x | x is a multiple of 3 less than 15 }, Z = {x | x is a real number greater than or equal to 5.5}.
What is X∩Y?
X∩Y is the intersection of sets X and Y. It is the set containing elements that are both in X and Y.
X = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14} (whole numbers less than 15)
Y = {0, 3, 6, 9, 12} (multiples of 3 less than 15)
The intersection of X and Y is the set containing elements that appear in both X and Y.
X∩Y = {0, 3, 6, 9, 12}
So, X∩Y = {0, 3, 6, 9, 12}.