Answers

2014-03-27T20:20:46+05:30
Solution

Take 4 , 4, 4 coins weigh it
1)  FIRST TRIAL
1st set  4 coin vs 2nd  set 4 coins
         if equal fake coin lies in the 3rd set of 4 coins
         else    the set of fake coins will weigh more
2) SECOND TRIAL
now after finding the fake set
     weigh in 2 coins
     1st set 2 coin vs 2nd set coin
      The fake coin set will weigh more
3) THIRD TRIAL
From the fake set of coins
        weigh in 1 coin
  The fake coin will weigh more..


Thus the fake coin was identified in 3 trials
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