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added 39 characters in body

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edited Mar 6 at 15:35

53.9k
7
124
215

The solution is

not unique. In the grid below, the 15 and 25 can be entered in the empty spots in either order.
 1  12 11 10 9
 13 2  23 22 8
 14 24 3  21 7
 .  .  20 4  6
 16 17 18 19 5

You can also reverse 21-25 as follows (and then you can still swap 25 and 7):
 1  12 11 10 9
 13 2  23 24 8
 14 22 3  25 7
 15 21 20 4  6
 16 17 18 19 5

The solution is

not unique. In the grid below, the 15 and 25 can be entered in the empty spots in either order.
 1  12 11 10 9
 13 2  23 22 8
 14 24 3  21 7
 .  .  20 4  6
 16 17 18 19 5

You can also reverse 21-25 as follows:
 1  12 11 10 9
 13 2  23 24 8
 14 22 3  25 7
 15 21 20 4  6
 16 17 18 19 5

The solution is

not unique. In the grid below, the 15 and 25 can be entered in the empty spots in either order.
 1  12 11 10 9
 13 2  23 22 8
 14 24 3  21 7
 .  .  20 4  6
 16 17 18 19 5

You can also reverse 21-25 as follows (and then you can still swap 25 and 7):
 1  12 11 10 9
 13 2  23 24 8
 14 22 3  25 7
 15 21 20 4  6
 16 17 18 19 5

Source Link

created Mar 6 at 15:30

Jaap Scherphuis

53.9k
7
124
215

The solution is

not unique. In the grid below, the 15 and 25 can be entered in the empty spots in either order.
 1  12 11 10 9
 13 2  23 22 8
 14 24 3  21 7
 .  .  20 4  6
 16 17 18 19 5

You can also reverse 21-25 as follows:
 1  12 11 10 9
 13 2  23 24 8
 14 22 3  25 7
 15 21 20 4  6
 16 17 18 19 5