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Brain Trainer
by William Armstrong
Updated:
1 Aug 2025
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Logical Lock Puzzle

Genre: Logic Rating: 4 - Medium Source: William Armstrong
Brain Functions: Analysis / Logic Hint    Solution

Logical Lock

Determine the 3-number combination needed to open the lock. The results of four tests are provided to help you solve the puzzle.

  1. 137 : Only one number is correct, and it is in the correct position.
  2. 942 : Two numbers are correct, but they are both in the wrong positions.
  3. 735 : One number is correct, but it is in the wrong position.
  4. 213 : One number is correct, but it is in the wrong position.

What are the correct numbers in the correct order?


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