Final answer:
After adding three new team members to the project, resulting in 22 stakeholders, there were 60 more communication channels than the original 171 channels when there were 19 stakeholders.
Step-by-step explanation:
When calculating the number of communication channels in a project, you can use the formula N(N-1)/2, where N is the number of stakeholders. Originally, with 19 stakeholders, the number of channels was 19(19-1)/2 = 171. After adding three more team members, you have a total of 22 stakeholders; thus, the new number of channels is 22(22-1)/2 = 231. The increase in communication channels is the difference between the new and original count, which is 231 - 171 = 60 more communication channels.