Given X = {1, 3, 5, 7, 8, 9}, Y = {2, 4, 7, 9}, and Z = {1, 2, 3, 4, 7}, solve the following.
a.X U Z = _____
b. X ∩ Y= _____
c. X ∩ Z = _____
d. X U Y U Z = _____
e. X ∩ Y ∩ Z = _____
f. (X U Y) ∩ Z = _____
g. (Y ∩ Z) U (X ∩ Y) = _____
h. X or Y = _____
i. Y and X = _____