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i was also told that all the coins looked identical, they were of the same shape and size, the only difference was that the fake was one gram lighter than the real ones(i was not told what is the actual weight of the real ones either). Now, using my two pan scale i had to find out the fake coin.

the real problem came when i was asked to do this in the minimum no. of turns.

Here i give you the same problem, and you have to tell me, how many turns do you need to find the fake, keep in mind that you have to do this in minimum no. of turns.

GOOD LUCK!!!!!!!