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Chris Heister and his son were among two father-and-son pairs who gathered to trade baseball cards. As each personarrived, he shook hands with anyone he
Chris Heister and his son were among two father-and-son pairs who gathered to trade baseball cards. As each personarrived, he shook hands with anyone he had not known previously. Each person ended up making a different number of new acquaintances (0-2), except Chris and hisson, who each met the same number of people. How many hands did Chrisshake?
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