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4 August, 20:05

You have a pile of 8 identical coins, and you know one of them is a fake and is lighter than the genuine coins. What is the minimum number of weighings needed to identify the fake coin with a two-pan balance scale without weights?

Write out your algorithm.

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  1. 4 August, 23:11
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    Answer:3

    Explanation: You need to find out the weight of the genuine coins which needs takes 2 weigh-ins to find out and then you need to find the coin with less weigh which will at minimum will take 1 try so a total of 3 weigh ins.
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