You have 8 coins. 3 of them weigh x units, 3 y units, 1 a units and 1 b units. They are all mixed and look identical. You have to find the lightest coin in minimum number of weighing (balance)
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Answer / sibananda dash
3 : suppose there are hhhlhhhh: h for heavy and l for light
8 coins ;
divide into two part i.e. hhhl ,hhhh;
take hhhl because it has less weight : as we have to find
light coin
similarly proceed in the same way ;
Answer : 3
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