Venn Diagrams

1) When you have A U B- you only use the middle cause thats the intersection
2) A upside down U B- union
3) A (line on top)- everthing but A
4) B (line on top)- everything but B
5) A- A and the intersection
6) B- B and the intersection
7) A upside down U B (line over everything)- everything but the intersection
8) A U B (line over everything)- number in the conner
9) A U B (line on top of b)- everything but the B
10) A upside down U B (line on top of B)- just A
11) A upside down U B (line of top of A)- just B
12) A U B (line on top of A)- everything but B

Example:
50 people went to the beach, 25 got bitten by mosquitoes and 12 got sunburned and 7 got both. how many got none?
Answer: 20!