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Coins 1, 2, 3 on one side. 4 ,5, 6 on the other.
If ths scale balances the odd weight coin is in group 7, 8, 9.
If it doesn't balance it is in the light group.
Take the odd weight group of 3 and place one coin on each side.
If it balances then the light coin is the one not being weighed.
If it doesn't balance it is the light side of the scale.
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