1. Union and Intersection
Sets
Union and Intersection

2. Notation { } Ex. Set A={2,4,6,8,10,12,…} - infinite set (never ends)
Ex. Set B={2,4,6,8,10,12}
- finite set (has a certain amount)
Ex. Set C={…,2,4,6,8,10,12,…}
- infinite set

3. Venn Diagrams Used to visually represent sets of data
An organization of data using overlapping circles
Data gathered in sets
Sets can be made up of numbers, amounts, etc.

4. Using the following sets create a Venn Diagram

5. Number Sets Set A = {3,6,9,12,15} Set B = {2,4,6,8,10,12,14}
Set C = {5,10,15}

6. Set A
{3,6,9,12,15}
Set B
Set C
{2,4,6,8,10,12,14}
{5,10,15}

7. Set A
3, 9 15
6,12
2,4,8,14 10 5
Set B
Set C

8. Symbols  - Union  - Intersection Ø – empty set
The following symbols can be used with Venn Diagrams and Sets
 - Union
Numbers that are in either or and both
Every number listed in order once
 - Intersection
Numbers that are in both
Ø – empty set
A set with no values

9. Using the number sets from before find the following:
1. A  B = 2. A  B =
3. A  C = 4. B  C =
5.ABC = 6.ABC =

10. AB= AB= AC= BC= ABC= ABC= {6,12} {10,15}
{2,3,4,6,8,9,10,12,14,15}
{10,15}
{2,4,5,6,8,10,12,14,15} Ø
{2,3,4,5,6,8,9,10,12,14,15}

11. Key Points
Set Notations
Venn Diagrams
Union
Intersection
Empty Set