When I calculate the number of communication channels (using formula [n * (n-1) / 2], you need number of the team members as input for the formula (n). I'm not sure whether I should count in also PM or not.

Example (made up question):

You are PM of the project with 6 persons. You have been added two additional resources... How much did communication channels increase...?

Now, should I:

A) calculate that the team has 6 team members + PM = 7 people (=n) and has increased from 7 to 9 persons (6 team members + PM + 2 new resources)

OR