allerySets A, B, C have 20, 15, 10 members. A∩B has 5, B∩C has 3, A∩C has 4, A∩B∩C has 2. Find |A∪B∪C|.
A35
B33
C37
D45
Answer & Solution
Correct answer: A. 35
Sum 45, minus pair overlaps 12 gives 33, then add back the triple overlap 2 to get 35.
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