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If A = {1, 2, 3, 4, 5}, B = {3, 4, 5, 6, 7}, find A ∩ B:
A{1,2}
B∅
C{3, 4, 5}
D{3, 4, 5}
Answer & Solution
Correct answer: C. {3, 4, 5}
Intersection = common elements = {3, 4, 5}. n(A ∩ B) = 3. By inclusion-exclusion: n(A ∪ B) = 5 + 5 - 3 = 7.
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