AMC 12 2017a Problem 5
- Paper
At a gathering of people, there are people who all know each other and people who know no one. People who know each other hug, and people who do not know each other shake hands. How many handshakes occur?
\textbf{(A)}\ 240 \textbf{(B)}\ 245 \textbf{(C)}\ 290 \textbf{(D)}\ 480 \textbf{(E)}\ 490
Dataset text AMC 12 2000 to 2025. Quoted with source.
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B
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