This comes from my brother Paul in Ann Arbor. The dialog reveals a logic problem. Can you solve it?
CasparEtt: got a good loginc problem for your kids
CasparEtt: are you interested
ncmathsadist: sure, show the problem
ncmathsadist: I will inflict it on my discreteG class
CasparEtt: A woman and her husband hosted a party for four other
couples. The hostess asked everyone to shake hands and introduce
themselves to each other. Of course, no one shook hands with his or
her spouse. At some point, the hostess stopped them and asked each
person how many hands he or she had shaken. Each person gave a
different response. What was the response of her husband?