Given 18 one rupee coins of which one is...

Given 18 one rupee coins of which one is counterfeit and weighs less than any of the others. Given a two pan balance, the minimum number of weighing required to identify the counterfeit is

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Verified by Experts

The correct Answer is:

`3^2 lt 18 lt 3^3` i.e. `9 lt 18 lt 27`.
So, the required minimum number of weighings = 3.

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