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Question
If A = {3, 5, 7, 9, 11} and B = {4, 7, 10}, find: A ∩ B and n(A ∩ B)
Solution
Find A ∩ B
The intersection of two sets A and B is the set of elements that are common to both. Comparing the elements of A and B:
Common element: 7
Thus: A ∩ B = {7}
Find n(A ∩ B)
n(A ∩ B) = 1.
A ∩ B = {7}
n(A ∩ B) = 1
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