Exam-style question
Try this first
Which statement about the empty set is correct?.
- A.It contains exactly one element, called Ø
- B.It contains no elements and may be written as {} or Ø
- C.It contains every possible element
- D.It contains an unordered collection in which every value occurs twice
Model answer
What a good answer should say
- It contains no elements and may be written as {} or Ø
Explanation
Why this works
The empty set is the set with no elements. It can be represented by {} or by the alternative symbol Ø.
Common mistake
No common mistake is linked to this question yet.