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Riddle (classic):
You are given 12 coins which are superficially identical.
But only 11 are really identical; the 12th is slightly
heavier or lighter. You are also given an old-fashioned
two-pan balance,
When I first saw this many years ago, the word two was not included in the
description of the balance, so I built a triangular balance and solved it
in two weighings.
Clarence P. Bennett
bennett@oakland.edu
Oakland University Physics
111 Hannah Hall
Rochester, MI 48309
248 370 3418