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Logic Puzzle: Can you find 2 counterfeit coins among 5 coins for 3 weighings?
Logic Puzzle: Can you find 2 counterfeit coins among 5 identical looking coins and determine which counterfeit coin is lighter and which is heavier than a real one if you can only use a balance scale 3 times?
Let’s try to solve a logic puzzle.
You have 5 identical looking coins. Two of them are counterfeit. One of the counterfeit coins is lighter than the real one, and the other is the same amount heavier than the real coin.
You have a balance scale so you can just compare the weight of coins against each other.
How would you find both counterfeit coins and determine, which counterfeit coin is lighter and which is heavier, if you could only use a balance scale 3 times?
0:00 Logic problem of how to find 2 counterfeit coins
0:48 Solution – General part
1:15 Solution – Part 1: During the first weighing the scale stays balanced
2:30 Solution – Part 2: During the first weighing the scale is not balanced
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