Question

Let S be the universal set, where: S={1,2,3,...,18,19,20}
Let sets A and B be subsets of S, where:

Set A={1,3,4,5,6,8,9,11,14,15,20}
Set B={1,2,5,6,8,9,11,13,14,15,16,18}
Find the following:
LIST the elements in the set (A∪B):
(A∪B)= { }
Enter the elements as a list, separated by commas.If the result is the empty set, enter DNE
LIST the elements in the set (A∩B):
(A∩B)={ }
Enter the elements as a list, separated by commas.If the result is the empty set, enter DNE

Answer 1

Answer:

A∪B = {1,2,3,4,5,6,7,8,9,11,13,14,15,16,18,20}

A∩B = {1,5,6,7,8,9,11,14,15}

Step-by-step explanation:

A∪B is the elements in A or B. So, for this question, we just need to find the numbers that are in A or B. Remember not to add anything that is not in set A or B and not write the same number twice.

A∩B is the elements in A and B. Therefore, for this question, we just need to find the numbers which appeared in both set A and B.

Hope this helps :)