The results of a survey of common allergies was
organized into a Venn diagram.
Answer the questions about the following sets:
D = {x|x is a person allergic to dogs); C = {xxis a
person allergic to cats): P = xxis a person allergic to
pollen)
15
7
18
How many people are not allergic to any of the three
choices?
How many people are allergic to all three choices?
How many people are allergic to both dogs and cats
but not allergic to pollen?
How many people are allergic to cats only? '