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Question ID 112165 (Universal ID 1479268763330959)

This question was written by Shahbazian,Roy, derived from work by WebWork-Rochester, mb Lippman,David, mb Sousa,James. This work is licensed under the IMathAS Community License (GPL + CC-BY).
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Other Attribution: Photo: ProfDEH CC-by-SA 3 unported https://en.wikipedia.org/wiki/File:Paris_folding_bike-2.jpg