Answer:
- n(U) = 20
- n(A) = 8
- n(B) = 5
- n(A'∪B) = 15
Step-by-step explanation:
For these sets, it is easy enough to list the elements and count them.
U = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20}
n(U) = 20
A = {1, 3, 5, 7, 9, 11, 13, 15}
n(A) = 8
B = {7, 11, 13, 17, 19}
n(B) = 5
A'∪B = {2, 4, 6, 7, 8, 10, 11, 12, 13, 14, 16, 17, 18, 19, 20}
n(A'∪B) = 15
