Easy. put three on each side. If one side is lighter, we'll continue with those three. If not, use the other (unweighed) set of three. You put one aside and weigh the other two. If one weighs less, that one is the one, otherwise it's the one that hasn't been weighed.
the way i would do it is just take one on one scale and another one on the other scale then look at how much they wiegh and if one of them is lighter than the other one than that would be the one that is fake...
samy
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