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Show that a tree has at least 2 vertices of degree 1

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Show that a tree has at least 2 vertices of degree 1?

A tree is a connected graph with no cycles. By definition, a tree with ( n ) vertices has ( n - 1 ) edges. If we assume there are no vertices of degree 1, then every vertex must have a degree of at least 2. This would imply that the minimum number of edges required to connect the vertices in such a case would exceed ( n - 1 ), leading to a contradiction. Therefore, a tree must have at least two vertices of degree 1, which are typically the leaf nodes.


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