Question

Given X = {15, 22, 33, 44, 89, 165, 1025} and Y = {-5, 15, 33, 88, 99, 150, 160, 1025}, which of the following statements is false?
X Y = {-5, 15, 22, 33, 44, 89, 99, 150, 160, 165, 1025}
X ∩ Y = {15, 33, 1025}
Ø ⊂ (X Y)

Answer 1

What is (X Y) meant?

Answer 2

X Y = {-5, 15, 22, 33, 44, 89, 99, 150, 160, 165, 1025}
I think it means \[X \cup Y\], right?