You are project manager and during the course of a project, the number of team members increases form six to ten. How many ADDITIONAL lines of communication channel now exist?
A.
10
B.
35
C.
30
D.
55
Explanation:
lines of communication channel = n(n-1)/2 So answer is 10(10-1)/2 – 6(6-1)/2 = 45-15 = 30