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Puzzle: what question one would ask to reach home safe ?

+4 votes
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A person reached at a point where he need to choose one of the two road, one would lead him to his home and the other would lead him to certain death two man stood at each road.one would always speak truth, the other always lie.

They informed him that he could ask just one question to any of them but did not tell him who was who. So,what question he would had asked to reach home safe ?

posted Jan 7, 2014 by Majula Joshi

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2 Answers

+1 vote

The way to do that is to use a double negative. An example is to point to one road (it makes
no difference which) and ask "If I asked you whether this is the
way to my home, would you say it is?"

answer Jan 13, 2014 by Atul Mishra
0 votes

Person can ask a question from a person on any of the road as "If I ask the other person where if his road goes to home what would he answer"

Now there are two possibilities say the person he selected and asked the question always lies then other person would be truth-teller and he will say yes if his road goes to home, no if does not take it to home and since selected person lies then he will say no (after negating the answer) if road goes to home else yes.

Now in other case say if the person he selected and asked the question is a truth-teller then other person would be liar and he will say no if his road goes to home, yes if does not take it to home and since selected person is a truth teller then he will say no if road goes to home else yes.

In both the cases answer is no if road takes it to the home else yes. So now person can behave opposite to the answer to reach home safely.

answer Jan 14, 2014 by Luv Kumar



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