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Question
Taking the set of natural numbers as the universal set, write down the complements of the following set:
{x : 2x + 5 = 9}
Solution
Here U = {x : x ∈ N}
Let A = {x : 2x + 5 = 9} = {2}
A' = U - A
= {x : x ∈ N} - {2}
= {x : x ∈ N, x ≠ 2}
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