8 Coins puzzle

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There are 8 identical coins.One of these coins is counterfeit and is known to be lighter than the genuine coins. What is the minimum number of weightings needed to identify the fake coin with a two-pan balance scale without weights?

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    Here are some variants of this puzzle :
    1.Minimum number of weighing required to find the fake coin when it is not known whether the fake coin is heavier or lighter.
    2.Find lighter fake coin from a set of 12 identical coins.

    pnikam Expert Answered on 22nd August 2015.
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