Fri 21 Aug 2009
The “Handshake” puzzle
Posted by Happy under puzzle
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You didn’t really think one puzzle was the end of it, did you?
Fred and Norma held a dinner party and invited 4 other couples. As people arrived, Fred noticed that people who knew each other hugged or kissed, but if they were strangers they just shook hands. After all the arrivals and all the introductions, Fred asked everyone including Norma how many hands they had shaken. To his surprise he got 9 different answers.
How many of the dinner guests were strangers to Norma?
Answer over the fold (more…)