Exam-style question
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Which statement correctly describes the relationship between {0, 1, 2} and ℕ?.
- A.{0, 1, 2} is a proper subset of ℕ
- B.{0, 1, 2} is equal to ℕ
- C.ℕ is a proper subset of {0, 1, 2}
- D.{0, 1, 2} has no relationship with ℕ
Model answer
What a good answer should say
- {0, 1, 2} is a proper subset of ℕ
Explanation
Why this works
Every element of {0, 1, 2} is in ℕ, and ℕ contains further elements such as 3. Therefore, {0, 1, 2} is a proper subset of ℕ, written {0, 1, 2} ⊂ ℕ.
Common mistake
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