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Lisa and Ro threw a party attended by 12 married couples. As the guests arrived some of them shook hands with Lisa or Ro or with other people who had already arrived. When all 24 guests had arrived, Lisa asked Ro and each guest how many hands that they had shaken. Every guest and Ro gave a different answer. No one shook the hand of their partner and no one shook hands with themselves. Lisa and Ro 'partnered' up to give the party.
Ro is a methodical person, no matter how many people show up, she shakes hands in the same manner. You could almost say that she's formulaic, and she's not shy. If any one shows up, she shakes at least one hand. How many hands did Ro shake?
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