What Is the Order of Mass from Lightest to Heaviest?

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It then takes only one more move to identify the light coin from within that lighter stack. So in two weighings, we can find a single light coin from a set of 3 × 3 = 9 . By extension, it would take only three weighings to find the odd light coin among 27 coins, and four weighings to find it from 81 coins.

What’s the maximum number of items you can compare to find the lighter one?

To find a solution, we first consider the maximum number of items from which one can find the lighter one in just one weighing. The maximum number possible is three. To find the lighter one, we can compare any two coins, leaving the third out.