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Wednesday, November 10, 2010

Handshaking

Puzzle

Jack and his wife went to a party where four other married couples were present. Every person shook hands with everyone he or she was not acquainted with. When the handshaking was over, Jack asked everyone, including his own wife, how many hands they shook. To his surprise, Jack got nine different answers.  
How many hands did Jack's wife shake? 

Solution

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