Solve the Puzzle: Find the Odd Coin in 3 Weighings

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SUMMARY

The discussion centers on the classic problem of identifying an odd coin among twelve, where one coin is either heavier or lighter. The solution requires a strategic approach using a balance scale in three weighings. Participants emphasize that this problem has been frequently posted and is simpler compared to more complex variations found in the "IBM Ponder This" challenges. The consensus is that mastering this problem enhances logical reasoning and problem-solving skills.

PREREQUISITES
  • Understanding of basic balance scale mechanics
  • Familiarity with logical reasoning and deduction techniques
  • Knowledge of combinatorial problem-solving strategies
  • Experience with mathematical puzzles and challenges
NEXT STEPS
  • Research strategies for solving combinatorial puzzles
  • Explore advanced variations of the coin problem on "IBM Ponder This"
  • Learn about decision trees and their application in problem-solving
  • Practice similar logic puzzles to enhance analytical skills
USEFUL FOR

This discussion is beneficial for mathematicians, puzzle enthusiasts, educators, and anyone interested in enhancing their logical reasoning and problem-solving abilities.

Harut82
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You have twelve coins, eleven identical and one different. You do not know whether the "odd" coin is lighter or heavier than the others. Someone gives you a balance and three chances to use it. The question is: How can you make just three weighings on the balance and find out not only which coin is the "odd" coin, but also whether it's heavier or lighter?
 
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this has been posted here repeatedly. There's a variation to this coin problem that is much more complex, I saw it at "ibm ponder this" a couple of years ago...it makes this problem seem too easy. You can search there "ponder this" database if you want a real challenge.
 

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