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It is the future, and social-distancing restrictions have been lifted. Dan and Amber decide to attend a party with four other married couples. When the

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It is the future, and social-distancing restrictions have been lifted. Dan and Amber decide to attend a party with four other married couples. When the guests are all there, each one shakes the hands of the people they haven't met. When Amber asks each guest how many hands he/she shook, she gets nine different answers. How many hands did Dan shake

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