you should have told earlier...... u just said different it means it can be lighter too the soln; wight 3 in each pan: if it is balanced, the heavy one is in the remaing 2 if it is not balanced - take two out and interchange 1 from the remaining 4 and weigh again if it is balanced the 1 you took out from the heavier side is the different one if it is still not balanced by interchanging you will know which one was making difference in the weight out of remaining 4 howz that?