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For A = {1, 2, 3}, identify which is a PROPER subset of A.

AA itself
Bℕ
C{1, 2, 3, 4}
D{1, 2}
Answer & Solution
Correct answer: D. {1, 2}
A proper subset of A is a set B with B ⊂ A and B ≠ A. {1, 2} ⊂ A and {1, 2} ≠ A → proper subset. A itself is a subset but not proper. {1, 2, 3, 4} is a SUPERSET, not subset. ℕ ⊅ A's complement.
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