Question 122499
A={1,2,3}
B={3,4,5,6} 
C={3,5,7}
Union is all elements of both sets.
Intersection is only the common elements to both sets.
a)A ∩ B = (3)
b)A ∩ C = (3)
c)A U C = (1,2,3,5,7)
d)B U C = (3,4,5,6,7)
e)(A U B) ∩ C=(1,2,3,4,5,6)∩(3,5,7)=(3,5)
f)A U (B U C)=A U (3,4,5,6,7)=(1,2,3,4,5,6,7)
g)	(A ∩ B) ∩ C=(3)∩ C=(3)
h)	(A ∩ B) U C=(3)U C=(3,5,7)