Goals
Think about the number of combinations of people shaking hands
What To Do
Break into groups of between 3 and 5. The smaller the group the simpler it will be but this does not work with 2 people in a group.
Ask the group to shake hands with every one in the group once. How many hand shakes are there
Ask the groups to write down all the combinations. You can use pairs of initials to save record this.
Make sure you have all the possibilities but have not counted any hand shakes twice
Homework
Background Info