Answer:
Hindi kudin Alam eh hahahha
Each of the 20 people has 19 other people to communicate to. If you add that all up you get 20*19 paths, but then each path is counted twice (back and forth), so we divide this by 2. 20*19/2 = 190.
The general forumula is n(n-1)/2
Answer: Flyer
Explanation: A flyer is a type of advertisement that is used to give out information about a certain product, event, or business. This can help communicate with potential customers.