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 Guess a number (Posted on 2005-04-14)
If I think of a number between 1 and 1,000, guessing it in 10 yes-no questions is easy... so that's not the puzzle!

Guessing it in 10 yes-no questions, that must be all asked in advance, is also relatively easy... so that's not the puzzle either!

How many questions would you need to guess my number, if you had to ask all questions beforehand, and I also could lie once?

 Submitted by Federico Kereki Rating: 4.3333 (12 votes) Solution: (Hide) 14 is the right answer -- use 10 questions to get the possible number, and 4 questions to validate the first ten questions.

 Subject Author Date Never too late to mention Hamming Ady TZIDON 2015-10-20 22:01:54 Answer K Sengupta 2008-12-12 13:02:49 re(2): Unexpected solution Tristan 2005-04-18 23:18:29 re: Unexpected solution armando 2005-04-18 21:25:57 re: Unexpected solution Leming 2005-04-18 00:41:08 Unexpected solution Tristan 2005-04-15 22:48:02 re: No Subject armando 2005-04-15 09:04:03 seems impossible ronen 2005-04-15 08:35:42 No Subject Leming 2005-04-15 00:13:39 Beginning of a solution Tristan 2005-04-14 23:26:22 14 are enough armando 2005-04-14 22:22:21 re: "In Advance" Erik O. 2005-04-14 22:20:42 guess a number Marian Elliott 2005-04-14 21:37:38 "In advance" Old Original Oskar! 2005-04-14 21:36:26 What does "in advance" mean? Erik O. 2005-04-14 21:29:33 My idea plus one Leming 2005-04-14 21:03:21 My idea e.g. 2005-04-14 20:55:30 Close... Federico Kereki 2005-04-14 20:48:15 Ideas Charlie 2005-04-14 19:17:58

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