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Question:

There are 10 stakeholders within your project. As the project manager, you must therefore operate 45 communication channels. Two additional stakeholders have been added. How many more channels of communication must you communicate?  

A 21 
Explaination

The addition of two stakeholders brought the total number of communication channels to 66. Remember that you must apply the formula for calculating communication channels, which is as follows:
n (n-1) ÷ 2
The question, however, asks how many more communication channels you will need to manage, meaning that you must now subtract the original number of channels from the new number of channels to get the answer (66 – 45). The answer is 21.