Prove that a tree with $n$ vertices has exactly $n-1$ edges.
The lack of an official, comprehensive solution manual is a significant point of discussion in the graph theory community. Many reviews and forum posts echo the sentiment of a frustrated reader on Douban.com, who noted that the provided answers were either absent or not helpful, complaining, “The hints given are as good as none”. Graph Theory By Narsingh Deo Exercise Solution
n(n−2)n raised to the open paren n minus 2 close paren power Here, Calculate: Prove that a tree with $n$ vertices has exactly $n-1$ edges