Help as soon as possible please thx The subject is Probability and Statistics

1.This operation tells that this set contains those elements in A, B or to both sets. *
Union of Sets
Intersection of Sets
Complement of a set
Difference of sets

2. If A = {1, 2, 3, 4, 5} and B = {2, 3, 4}, What is A ∩ B? *
{1, 3, 5}
{2, 3, 4}
{1, 5}
{ }

3.It is the set containing those elements belong to A and B.
Union of Sets
Intersection of Sets
Complement of a Set
Difference of Sets

4.If C = { a, b , c} , D = {b, c, d} , E = {d , e, f, g}. What is C ∪ D ∪ E?
{b , c}
{d, e}
{a, b, c, d, e, f}
{a, b, c, d, e, f, g}