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Question
Examine if the following set is the empty set:
{x + 3 = 2 and x ∈ N}
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Solution
{x + 3 = 2 and x ∈ N}
x ≠ 3 = 2 ⇒ x = 2 - 3 = -1
which is not a natural number.
∴ It is an empty set.
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