Math Puzzles
Topology
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Connected Loops
We challenge you to find a way to tie the three loops of string together so that untying any one of them causes the other two to be disconnected.
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The Seven Bridges of Königsberg
There are seven bridges in Königsberg. Can you cross each bridge just once without missing any of them?
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The FedEx Problem
Federal Express is a company that ships packages from one city to another by airplane. In the United States they use a system that might at first glance seem very odd and inefficient.
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The Four-Color Theorem
The small island nation of Seedonia is organized into three provinces: Sciville, Connexia, and Collabdale.
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The Lines Problem
Draw a continuous line made up of no more than four straight segments that goes through all of the nine dots.
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Trees in a Row
You have seven trees to plant. They need to be arranged in six rows with three trees in each row. How do you do it?
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More Trees in a Row
You have ten trees. Can you arrange them in four rows of five?
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Which Bike Is Free?
Bart, Chang, and Omar rode their bicycles to school. Each had a chain and a lock. Bart locked his bike to a lamppost and to Chang’s bike.
