A cylindrical hole 6 inches long has been drilled straight through the center of a solid sphere. What is the volume remaining in the sphere?
(Yes, there’s really enough information to solve this!)
Source: Hexaflexagons, Probability Paradoxes, and the Tower of Hanoi, by Martin Gardner.
A very fun book!
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Musings of a music-and-art-loving math grad student.
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