The following graphical solution of the coins problem is created
by Xenia Cherkaev. e-mail,
Web Page

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Step one

Split coins into 3 equal groups.

Group 1
Group 2
Group 3

Compare the weight of groups 2 and 3

If the coins are in equilibrium,
the false coin is in group 1.
If the coins are not in equilibrium,
then group 1 contains only good coins
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