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yes i think this could be the answer.
please @chubbyminsa would u please disclose before us the right answer.

It's the only possible Answer. :)

  1. 738 -> the code doesn't contains the numbers 3,7,8
  2. 780 -> the 0 must be at first or second position
  3. 206 -> the 0 is not at the second position. Now we know the first digit is the 0
  4. 682 -> the well placed number must be the 2. Now we know the last digit is the 2. Also we know that the code does not contain a 6.
  5. 614 -> the 1 could not be the right number for the second digit, and the code does not contain a 6. So we know that the second digit was a 4.
  6. Now we have the correct code 042

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