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Question
If U = {x/x ∈ N, 1 ≤ x ≤ 12}, A = {1, 4, 7, 10}, B = {2, 4, 6, 7, 11}, C = {3, 5, 8, 9, 12} Write the set: A ∪ B.
Solution
U = {x / x ∈ N, 1 ≤ x ≤ 12} = {1, 2, 3, …., 12}
A = {1, 4, 7, 10} B = {2, 4, 6, 7, 11}
C = {3, 5, 8, 9, 12}
A ∪ B = {1, 2, 4, 6, 7, 10, 11}
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