Mathematics, 24.10.2020 22:20, demarley3093

At a gathering of 10 people, there are 4 people who all know each other and 6 people who know no one. People who do not know each other shake hands. How many handshakes occur?

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At a gathering of 10 people, there are 4 people who all know each other and 6 people who know no one...