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6 people attended a meeting. If all guests shook hands with everyone (no pair shook hands more than once), how many handshaking events were there?

 Jun 27, 2020
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6 people must shake hands with 5 other people   = 30 handshakes

   BUT each hand shake involves TWO people    30/2 = 15 handshakes

 Jun 27, 2020
edited by ElectricPavlov  Jun 27, 2020

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