# Graphs : Connectedness, Vertices and Edges

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11. Let G be a graph with n>= 2 vertices.

a) Prove that if G has at least (n-1) + 1 edges the G is connected.

( 2 )

b) Show that the result in (a) is best possible; that is, for each n>= 2, prove there is a graph with (n- 1)

( 2 )

edges that is not connected.

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##### Solution Summary

Connectedness, Vertices and Edges are investigated. The solution is detiled and well presented.

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(a) Prove by contradiction:

We know the number of edges in a complete graph with n nodes is (because in a complete graph, every node is connected to other n-1 nodes, therefore the degree of every node is (n-1), and the total degree of ...

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