Fiona walks through the auditorium, close enough to different groups of students to hear what they are talking about. She can talk to any, all, or none of the groups. She approaches...

Betsy and Sissy
(AND vs OR)
Boomer and Ed
(Pigeonhole Principle)
Darla and Cam
(Number of Subsets)
Jack and Chrissy
(AND rule for more than 2 things)
Greta
(Inclusion-Exclusion Principle)

the exit.