Number of Handshakes

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This Demonstration shows the total number of handshakes (pairwise connections) among a group of people. The person adds
connections, the number of people already in the group. So if
is the number of connections between
people,
and
.
Contributed by: Bob Hanlon (March 2011)
Suggested by: Matthew Hoek and Daniel Lichtblau
Suggestions by: Daniel Lichtblau and Sjoerd C. de Vries
Open content licensed under CC BY-NC-SA
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"Number of Handshakes"
http://demonstrations.wolfram.com/NumberOfHandshakes/
Wolfram Demonstrations Project
Published: March 7 2011