Three boxes are kept between box B2 and Box B6.
Box B2 is kept above box B6.
Two boxes are kept between box B6 and box B1, which is kept below box B6.
| | Case 1 | Case 2 |
| Position | Box | Box |
| 9 | B2 | |
| 8 | | B2 |
| 7 | | |
| 6 | | |
| 5 | B6 | |
| 4 | | B6 |
| 3 | | |
| 2 | B1 | |
| 1 | | B1 |
Four boxes are kept between box B1 and box B7, which is kept immediately below box B3.
| | Case 1 | Case 2 |
| Position | Box | Box |
| 9 | B2 | |
| 8 | B3 | B2 |
| 7 | B7 | B3 |
| 6 | | B7 |
| 5 | B6 | |
| 4 | | B6 |
| 3 | | |
| 2 | B1 | |
| 1 | | B1 |
The number of boxes kept above box B3 is same as the number of boxes kept below box B9.
Thus, Case 1 gets cancelled.
| | Case 2 |
| Position | Box |
| 9 | |
| 8 | B2 |
| 7 | B3 |
| 6 | B7 |
| 5 | |
| 4 | B6 |
| 3 | B9 |
| 2 | |
| 1 | B1 |
Box B4 is kept above box B5 but not at the topmost position.
| Position | Box |
| 9 | |
| 8 | B2 |
| 7 | B3 |
| 6 | B7 |
| 5 | B4 |
| 4 | B6 |
| 3 | B9 |
| 2 | B5 |
| 1 | B1 |
Now, only box B8 is remaining.
| Position | Box |
| 9 | B8 |
| 8 | B2 |
| 7 | B3 |
| 6 | B7 |
| 5 | B4 |
| 4 | B6 |
| 3 | B9 |
| 2 | B5 |
| 1 | B1 |
This is the final arrangement.
Except box B6, all other boxes are kept at an odd number position.
Study Notes
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