80 Coins
Given `80` coins that look identical. One of the coins is counterfeit and weighs less than a regular coin. How can you find the counterfeit coin using four weighings on a balance scale without weights?
Difficulty level (1 very easy - 10 very hard): 3
Topics:
Combinatorics
->
Induction (Mathematical Induction)
Logic
->
Reasoning / Logic
Algorithm Theory
->
Weighing
Minimum and Maximum Problems / Optimization Problems
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