9 November 2014

A logical puzzle

A logician visits a distant planet inhabited by two groups of aliens, compulsive liars and faithful truth-tellers. 

She comes to a fork in a road - one road goes to the left, the other to the right. She meets two aliens there, one a liar, the other a truth-teller... but she doesn't know which is which. 

The logician must ask just one Yes/No question to discover which road she should take to reach their leader. She thinks for a moment and then asks her question. 

What question might she have asked?

Post your theories and ideas as comments to this post...

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