Answer:
Total number of people involved in the diagram = 81
n(AUB) = 73
n(CnB) = 2
Explanations:
a) Total number of people involved in the diagram = 45 + 11 + 8 + 10 + 3 + 2 + 2
Total number of people involved in the diagram = 81
b) Number of people in the set AUB
n(AUB) = 45 + 10 + 11 + 3 + 2 + 2
n(AUB) = 73
c) Number of people in the set CnB
n(CnB) = 2