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Question
Find the union of the following pairs of sets:
A = {x : x is a natural number and multiple of 3}
B = {x : x is a natural number less than 6}
Solution
A = {x : x is a natural number and multiple of 3} = {3, 6, 9, 12, ….}
And B = {x : x is a natural number less than 6} = {1, 2, 3, 4, 5}
A ∪ B = {1, 2, 4, 5, 3, 6, 9, 12, 15, ….}
∴ A ∪ B = {x : x = 1, 2, 4, 5 or a multiple of 3}
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