## On the tic-tac-toe board

*Difficulty level:*

PLACE NUMBERS 1, 2, 3, 4, 5, 6, 7, 8 AND 9 DISPOSED IN THE 9 HOUSES OF AN OLD GAME TABLE THAT THE SUM OF THE 3 RIGHTS OF ANY STRAIGHT AND ANY DIAGONAL RESULT **15**.

*Difficulty level:*

PLACE NUMBERS 1, 2, 3, 4, 5, 6, 7, 8 AND 9 DISPOSED IN THE 9 HOUSES OF AN OLD GAME TABLE THAT THE SUM OF THE 3 RIGHTS OF ANY STRAIGHT AND ANY DIAGONAL RESULT **15**.