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A nice discovery of triangular numbers is the handshake problem, revised here as the High Five Problem.
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The High Five Problem
• The students in our class did an awesome job working on their group projects.
• At each table, the students gave each other a high five at the end of math class.
• I wonder how many high fives that was!
Give Me Five!
• If you do that in your group, how many high fives will there be?
• What if everyone in this class gave each other a high five? How many high fives would there be?
Your Turn...