A complete graph is a graph, which has edges connecting all pairs of vertices.
Essential Further Mathematics 4ed 2012 (page 624)
*In the above diagram, only K5 is a complete.
To work out the number of edges a complete graph will have, the vertices can be used to work that out using this formula:
where ‘n’ is equal to the number of vertices.
In order to determine whether a graph is complete, from an adjacency matrix one key feature to look for in the matrix is a row of 0s in the diagonal, with 1s filling the rest of the matrix.
Essential Further Mathematics 4ed 2012 (page 624)
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