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There are 9 coins, one of which is lighter or heavier than the others. The problem is to identify the odd coin in the fewest number of weighings. This can be done in 3 weighings by: 1) Weighing groups of 4 coins against each other to identify an uneven group. 2) Weighing subsets of the uneven group on a second scale to identify the odd coin as either heavier or lighter. 3) Weighing the remaining coin against another to confirm the identity of the odd coin.

Author

Rajesh Kumar

Language

EN