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
int sum = 0, n;
do {cin>>n; sum+=n;}while (n!=0);
cout<<sum;
Answer:
The term used to passed one computer to another is called a packet
Yea, I don’t think you can fix it unless you backed it up or something somehow...
