|Aug17-07, 05:18 AM||#1|
Now you have 12 coins, one of which may be a fake. A fake coin has a different weight than a genuine coin, but you don’t know whether it is lighter or heavier.
How many weighings do you need in order to determine the identity of the fake coin, if any, whether it is lighter or heavier? and how ?
EDIT: sorry it's been posted before.
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