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Question
Write the following set in the set-builder form:
{3, 6, 9, 12}
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Solution
Let A = {3, 6, 9, 12}
All elements of the set are natural numbers that are multiples of 3.
{3, 6, 9, 12} = {x : x = 3n, n ∈ N and 1 ≤ n ≤ 4}
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