Use 1, 2, 3, 4, 5, 6, 7, 8 and 9 to fill in the nine palace grid, so that the number of horizontal, vertical and diagonal lines is 16 If not, it's OK

Use 1, 2, 3, 4, 5, 6, 7, 8 and 9 to fill in the nine palace grid, so that the number of horizontal, vertical and diagonal lines is 16 If not, it's OK

Impossible, because the sum of all the numbers in the three rows is 1 + 2 + 3 +... + 9 = 45
And the number of each row is equal, so the number of each row is 45 / 3 = 15
This is in contradiction with the result of 16 per line, so it is impossible