How to find the set U B?

Question

Sorry, I am new to this so....would someone please put in english the following: Now find all the elements in Set B that are not in Set A.

The elements in Set B that are not in Set A are

Answer 1

In general, I believe this is called set difference.

Given any two set A and B, (what you are looking for)

B - A is the set of all elements of B which do not appear in A.

Or the B - A is the set of all element of B that do not belong to the intersection of B and A.  

Answer 2

It is difficult to answer this question without having examples of sets to work with. So suppose that

A = {1, 2, 3, 4, 5, 6} and B = { 3, 4, 5, 6, 7, 8. 9 }

Since 3, 4, 5, 6 are in A and B, the elements in set B that are not in set A are { 7, 8, 9 }