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Answers

In: One Hundred Prisoners and a Light Bulb

Author

Listed:
  • Hans van Ditmarsch

    (Université de Lorraine, LORIA, CNRS)

  • Barteld Kooi

    (University of Groningen, Faculty of Philosophy)

Abstract

You cannot see what is written on your own forehead. But you can see what is on the forehead of the person who you are talking to. In the original version of the riddle you only know your own number, but not the other’s number. In this version you only know the other’s number, but not your own number. Otherwise, there is no difference. After the announcements the remaining number pairs are now $(2,1)$ and $(3,2)$ , not $(1,2)$ and $(2,3)$ .

Suggested Citation

  • Hans van Ditmarsch & Barteld Kooi, 2015. "Answers," Springer Books, in: One Hundred Prisoners and a Light Bulb, edition 127, chapter 13, pages 157-181, Springer.
    • Handle: RePEc:spr:sprchp:978-3-319-16694-0_13
    DOI: 10.1007/978-3-319-16694-0_13
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