1. SETS AND VENN DIAGRAMS

2. and A = {Tuesday, Thursday}. These can be shown on a Venn diagram.
The language of sets
The universal set ( ) contains all the elements being considered in a particular problem.
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday A
Let = {days in the week}
and A = {Tuesday, Thursday}.
These can be shown on a Venn diagram.
The set A has been shaded on the diagram.
The number of elements in set A is denoted by n(A).
n(A) = 2
The symbol means ‘is a member of’.
The symbol means ‘is not a member of’.

3. Venn diagrams

4. The complement of set A is the set of all elements not in A.

5. The intersection of sets A and B is the set of elements that are in both A and B.

6. The union of sets A and B is the set of elements that are in A or B or both.

7. When the expressions are more complicated you may need to use some diagrams for your working out before deciding on your answer .

8. Example 1 A B A B A B

9. Example 2 A B A B A B

10. Example 3 A B A B

11. Example 4 A B A B A B

12. Example 5 A B A B A B

13. Example 6 A B C

14. Example 7 A B C

15. Example 8 A B C A B C A B C

16. Example 9 A B C A B C A B C

17. Example 10 A B C A B C A B C