There are 5 couples attending a party. Everyone shakes hands with the people they don’t know. John asks everyone at the party, including his wife, how many hands they shook, and gets 9 different answers. How many hands did John’s wife shake?
Source: Paraphrased from ‘Art and Craft of Problem Solving’, by Paul Zeitz
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Zach Marinovhttps://etonstem.com/author/zach
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Zach Marinovhttps://etonstem.com/author/zach
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Zach Marinovhttps://etonstem.com/author/zach
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Zach Marinovhttps://etonstem.com/author/zach
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