A short introduction

Solution to: The Triangle

There are 18 solutions to this problem, when you leave out all rotations and mirror solutions. They are all listed below:
        1
      5   7
    9       6
  2   4   8   3

        1
      5   8
    9       3
  4   2   6   7

        1
      6   9
    8       4
  2   5   7   3

        1
      6   9
    8       2
  4   3   5   7

        1
      6   7
    8       3
  5   2   4   9

        2
      4   7
    9       3
  5   1   6   8

        2
      5   6
    9       4
  3   1   8   7

        2
      6   9
    7       1
  5   3   4   8

        2
      6   9
    8       1
  3   4   5   7

        3
      2   6
    9       4
  7   1   5   8

        3
      4   9
    8       1
  5   2   6   7

        3
      4   7
    8       2
  6   1   5   9

        3
      5   9
    6       1
  7   2   4   8

        3
      5   8
    7       1
  6   2   4   9

        4
      2   7
    9       3
  5   1   8   6

        4
      3   9
    8       1
  5   2   7   6

        7
      2   4
    6       3
  8   1   5   9

        7
      3   6
    5       1
  8   2   4   9


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