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It is an old problem. I think it's in the classic "Concrete Mathematics" by Graham, Knuth, Patashnik but I doubt it's the original source.


Yeah, I had it in my undergrad intro to mechanics textbook. Still a great problem!


I think it was in Halliday and Resnick. I remember doing it in my high school physics class. We used the 3rd edition of that book, which was from 1979.


I've found it in both the second edition and the seventh, both asking for just the 4-block case.


Nice research!

Then that means my memory is wrong. Fallible is the mind. :)




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