Last week Richard Saunders was in Edinburgh and kindly interviewed me for his weekly podcast The Skeptic Zone – you can listen to it here.
So, to the puzzle……
The people who live on the next street are strange. Those who live at odd numbered houses always lie, and those who live at even numbered houses always tell the truth.
The other day I met a group of three people from the next street and asked them whether they were from odd or even numbered houses. The first one murmured something that was too soft to hear. The second replied, “He said he was from an odd numbered house.” The third then said to the second, “You are a liar!”
Did the third person live at an odd or even numbered house?
If you haven’t tried to solve the puzzle, have a go now. For everyone else, the answer is after the break.
If the first person was from an even numbered house, they would say so. If the person was from an odd numbered house, they would say that they were from an even numbered house. Therefore, the second person had to be lying. The third person truthfully identified the liar and was therefore telling the truth, so they must live in an even numbered building.
Did you solve it?
I have produced an ebook containing 101 of the previous Friday Puzzles! It is called PUZZLED and is available for theKindle (UK here and USA here) and on the iBookstore (UK here in the USAhere). You can try 101 of the puzzles for free here.