Write in each of the 9 boxes of a board of size 3 x 3 one of the figures 1, 2 or 3, so that the sum of the figures written in each row, column and in any diagonal of the square is equal to 6. No number can be repeated in each row, column or diagonal.

#### Solution

There are several different solutions. All of them can be achieved by rotating or inverting the first

solution:

1 | 3 | 2 |

3 | 2 | 1 |

2 | 1 | 3 |

3 | 1 | 2 |

1 | 2 | 3 |

2 | 3 | 1 |

2 | 1 | 3 |

3 | 2 | 1 |

1 | 3 | 2 |