RE: Maths Brain Teasers 126 :: Can You Solve 3 Digit Lock Puzzle?

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I agree with @satorihime the answer is 3-0-2

My method:

  • On line one ( 1-4-2) we have one number well placed, as the 4 is wrong according to line three we have 2 posibilities:
    1-?-? or ?-?-2
  • According to line two, two numbers are corrects and well placed (3-0-9)
    The 0 is correct and well placed because it doesn't interact with previous possibilities, so the new posibilities are:
    1-0-9 or 3-0-2
  • On line four one number is correct but wrongly placed (1-3-9)
    So for our previous possibilities it can't be the first (1-0-9) because we would have two numbers correctly placed.
    Then only one possibility remains and we have the code:
    3-0-2

!LOLZ



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