How many different communication channels does a project team with six people have? How many more communications channels would there be if the team grew to 10 people?
Number of communications channels = 
Therefore:
With 6 team members -
communication channels = (6*(6-1))/2 = 30/2 = 15
With 10 team members -
communication channels = (10*(10-1))/2 = 90/2 = 45
This model of representing communication channels provides a clear visual and mathematical representation of the different communication paths available within a team environment.