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Guess a number (Posted on 2005-04-14) Difficulty: 4 of 5
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?

See The Solution Submitted by Federico Kereki    
Rating: 4.3333 (12 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
SolutionNever too late to mention HammingAdy TZIDON2015-10-20 22:01:54
AnswerK Sengupta2008-12-12 13:02:49
re(2): Unexpected solutionTristan2005-04-18 23:18:29
re: Unexpected solutionarmando2005-04-18 21:25:57
re: Unexpected solutionLeming2005-04-18 00:41:08
SolutionUnexpected solutionTristan2005-04-15 22:48:02
re: No Subjectarmando2005-04-15 09:04:03
seems impossibleronen2005-04-15 08:35:42
SolutionNo SubjectLeming2005-04-15 00:13:39
Beginning of a solutionTristan2005-04-14 23:26:22
14 are enougharmando2005-04-14 22:22:21
re: "In Advance"Erik O.2005-04-14 22:20:42
guess a numberMarian Elliott2005-04-14 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
SolutionMy idea plus oneLeming2005-04-14 21:03:21
My ideae.g.2005-04-14 20:55:30
Some ThoughtsClose...Federico Kereki2005-04-14 20:48:15
Some ThoughtsIdeasCharlie2005-04-14 19:17:58
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