Answer
1.{1,2,3,4}
2.{1,2,3,4,5}
3.{2,3,4,5}
4.{2,3,4,5,6}
5.{2,3}
6.{3}
7.{}
8.{4}
9.{1,2,3}
10.{3}
Explanation:Union/U
is the set containing all the elements that are in A or in B.
Example:if A={1,2,3} and B={1,2,4,5,6} then A U B={1,2,3,4,5,6}
Intersection/∩
the set that consist of all elements that are both in A and B.
Example:if A={1,2,3} and B={1,2,4,5,6} then A ∩ B={1,2}
Difference/-
is a set of elements in A that are not in B.
Example:if A={1,2,3} and B={1,2,4,5,6} then A - B ={3} while B - A={4,5,6}