The more people involved in the exchange of information the more complicated the communication process will be.
A channel refers to the path between parties involved in the communication process, and each channel adds complexities because it increases the change for miscommunication.
The formula for calculating the number of channels is:
n(n-1)/2 (where n is the number of people)
In a simple one-on-one conversation, there is only one communication path between the two parties.
Channels: 2(2-1)/2 = 1
If two more people join the conversation, there are six channels of communication between those four people.
Channels: 4(4-1)/2 = 6
If there are eight people involved, the number of channels increases to 28.
Channels: 8(8-1)/2 = 28