14.2 - Counting Pairs
Links and useful resources
- gr7's Prealgebra Course Outline START HERE<<<
- AoPS Online Textbook
- IXL Grade 7 index
- IXL Grade 8 index
- AoPS Alcumus
- IXL prealgebra practice index
- OpenSTAX Prealgebra-1 textbook
Concept summary and lesson
- How do you count things in situations where the order of the things in a group doesn't matter?
Worked examples
Media resources
Guided practice
-
- (a) If each person shakes hands with each other person, then how many total handshakes are there?
- (b) If no two men shake hands, but each woman shakes hands with each other person, then how many total handshakes are there?