Hogwarts Express Problem Solving Set

Patterns

5. On the day of Harry's 1st Quiddich match, the 7-member team gathers in the locker room for the captain's pep talk. When Wood finishes his speech, each team member shakes hands with every other team member. How many handshakes occur?

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Notes:

Solution:

People Handshakes

2 1

3 3

4 6

5 10

6 15

7 21

There will be 21 handshakes.