Date 04·10·26
Reunion handshakes
Six old friends meet for a reunion. Everyone shakes hands with everyone else exactly once.
How many handshakes are there?
Need a nudge?
1
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For a counting problem
Satyendra Nath Bose
In 1924 he sent Einstein a new way of counting the states of light. Einstein translated it into German himself and had it published.
Particles called bosons are named after him.
Unknown author, Public domain, via Wikimedia Commons