Exam-style question
Try this first
Which statement about a tree is correct?.
- A.It must have exactly one root
- B.It must be directed
- C.It does not have to have a root
- D.Every node must have at least one child
Model answer
What a good answer should say
- It does not have to have a root
Explanation
Why this works
A tree does not have to have a root. A rooted tree is formed when one vertex is designated as the root.
Common mistake
No common mistake is linked to this question yet.