There are 10 similar coins, but 2 of them are fake. The fake ones are lighter than the real ones, but both have the same weight. You are give a balance scale, and you should determine which coins are fake. At least how many weighings do you need to find the fake coins?
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Hmm. I think you'd need 3. Say you got the two fake ones in a row. You can't really go off of that since you have nothing to compare it to. So, you'd have to weigh a third to see if they were the real coins or the fake ones. Make sense?
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