Question

1. Let P = {4, 5, 6, 7, 8}, Q = {5, 6 ,7}, and R = {1, 2}.
Find P U Q.
a. {1, 2, 4, 5, 6, 7, 8}
b. {5, 6 ,7}
c. {4, 5, 6, 7, 8}
d. 0 with a line through it

2. Let P = {6, 7, 8, 9, 10}, Q = {7, 8, 9}, and R = {3, 4}.
Find P (Upside down U) Q.
a. {3,4}
b. {7, 8, 9}
c. {6, 7, 8, 9, 10}
d. 0 with a line through it, empty set

Answer 1

since Q⊂P, PUQ = P

Ø is the Greek letter phi
It indicates a set with no elements in it

since Q⊂P, P∩Q = Q

Looks like you need to study up on subsets