A graph with n vertices is a tree if and only if it has n - 1
Question:
A graph with n vertices is a tree if and only if it has n - 1 edges and has no cycles.
Data from Prob. 16
If a graph has no cycles, it must have at least 2 vertices of degree 1
Data from Prob. 18
A tree with n vertices has n - 1 edges. (Proof by induction.)
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