Question

please help!!!!!!
 Fiona is people-watching again. She spies a group of ten high schoolers and starts playing a game by herself, in which she looks at a pair of people from the group of ten and tries to guess whether they like or dislike each other. How many pairs of friends can she observe before she runs out of pairs to evaluate?

Answer 1

I mean if there are 10 High Schoolers then all you have to do is divide by two (since your looking for pairs) and you get 5 pairs.