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A project team includes 5 people when the project manager adds two more, how many additional channels of communication are there?
a) 7
b) 10
c) 21
d) 11Correct answer is D.
Previous communication channels = n*(n-1)/2 = 5*(5-1)/2 = 10
New communication channels = n*(n-1)/2 = 7*(7-1)/2 = 21
Additional channels = 21 – 10 = 11
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