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coins
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There are 9 coins, one of which is a fake. This fake coin is lighter as compared to other coins. Use a balance to weigh them in the minimum number of steps and find the fake coin.
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Two weighings:
Divide the coins into three sets of 3, choose two sets and weigh them against each other. If they weigh the same, the fake is in the third set; if not it's in the lighter set.
Take the three coins containing the fake, and weigh two of them against each other. If one is lighter it's the fake; if they weigh the same the third one is.
Divide the coins into three sets of 3, choose two sets and weigh them against each other. If they weigh the same, the fake is in the third set; if not it's in the lighter set.
Take the three coins containing the fake, and weigh two of them against each other. If one is lighter it's the fake; if they weigh the same the third one is.
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