Concept explainers
Fire drill (ExH). A fire starts in your fifth-floor room. All you have available is a collection of slippery three-foot loops. They are strong, but short. You have a post in the room around which you can link one. How can you arrange the loops so that you can climb down? (The loops are too small and slippery to tie together by doubling them up and using them as if they were small pieces of rope.)
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The Heart of Mathematics: An Invitation to Effective Thinking
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