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Easy logical number puzzle

  1. May 18, 2005 #1
    Open attached file and

    Fill in numbers 1 to 9 such that no number repeats in any column or row.

    What are the numbers in the first column - in sequence top down?

    here is also a link numblock1.gif
     

    Attached Files:

    Last edited: May 18, 2005
  2. jcsd
  3. May 18, 2005 #2
    :smile: I have added a trainer :smile:

    Fill in numbers 1 to 5 such that no number repeats in any column or row.

    complete the number in the first row 3***1

    here is the file trainer.gif
     

    Attached Files:

    Last edited: May 18, 2005
  4. May 18, 2005 #3
    I wrote a computer program to solve this:


    6 1 2 5 4 3 7 # 8 9
    1 2 3 4 # 5 9 6 7 8
    2 4 5 9 1 7 3 8 # 6
    3 5 6 2 7 8 # 1 9 4
    4 7 # 8 9 1 6 3 2 5
    7 8 9 # 2 6 4 5 1 3
    5 # 7 3 8 9 1 4 6 2
    9 6 8 7 3 # 5 2 4 1
    8 9 1 6 5 4 2 7 3 #
    # 3 4 1 6 2 8 9 5 7


    The program quits when it finds a solution so I don't know if there are others. By coincidence, the program ran about 20 times faster than would be expected just because by fantastic luck, the first two guesses it made were correct. If I had moved vertically down the matrix instead of horizontally across, it would have run even faster as the first four guesses would have been correct.
     
    Last edited: May 18, 2005
  5. May 18, 2005 #4
    that was quick. !!

    I used an exel spread sheet to generate puzzle
     
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