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Question:

A project manager managing a small project has a total of 12 active stakeholders. How many lines of communication are there in your project? 

A 66
Explaination

The formula for calculating lines of communication is as follows, where n represents the total number of stakeholders (you are already assumed to have been included in the number):
n (n – 1) ÷ 2
Plug in the numbers to get the following: 12(12 − 1) ÷ 2 = 66.