Question 21
MediumOriginal questionis a relation on . Which of these describes ?
Show the answer and explanation
CorrectNot quiteAnswer A
Correct answer: A
Explanation
It is not reflexive, since is missing.
It is symmetric, since each pair's reverse is in , and transitive, since no pairs in lack .
Worth noting
Check reflexivity with care: it is not reflexive, since is missing.
- Concept
- Testing a relation on a finite set
- Typical timeTypical
- 90 s
- Your timeYours
- —
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