Configuration - 1               Configuration - 2

+----+----+----+----+        +----+----+----+----+
| 8  | 7  | 9  | 4  |        | 8  | 7  |  9 | 4  |
+----+----+----+----+        +----+----+----+----+
| 5  | 3  |    | 13 |        | 5  | 3  |    | 13 |
+----+----+----+----+        +----+----+----+----+
| 10 | 2  | 6  | 12 |        | 10 | 2  | 12 | 6  |
+----+----+----+----+        +----+----+----+----+
| 15 | 1  | 14 | 11 |        | 15 | 1  | 14 | 11 |
+----+----+----+----+        +----+----+----+----+

The task is to place the tiles in order to complete the 15 Puzzle.

Which of the above configurations does not have a solution and why?

For the configuration having a solution, what is the minimum number of moves to achieve this?