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A complete graph is a type of graph in graph theory where every pair of distinct vertices is connected by a unique edge. In simpler terms, imagine a set of dots (vertices), and every single dot is directly linked to every other dot by a line (edge).12

This means that if you have n vertices, each vertex will have an edge connecting it to the other n-1 vertices. Complete graphs are often denoted as Kn, where n represents the number of vertices. For example, K3 is a triangle, and K4 is a square with its two diagonals.2

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2 Britannica Sources
  1. complete graph
  2. graph theory

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