Concept explainers
Lasting ties. Tie a thin rope around a friend’s wrists, and then tie another one around your own, with the ropes linked as pictured. Can you unlink yourselves without cutting the ropes? Why or why not? (This challenge is one you should definitely make physical!)
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The Heart of Mathematics: An Invitation to Effective Thinking, WileyPLUS NextGen Card with Loose-leaf Set Single Semester: An Invitation to Effective Thinking (Key Curriculum Press)
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