Seven boxes- B1, B2, B3, B4, B5, B6 and B7 are kept one above the other but not necessarily in the same order. The bottommost position is numbered as 1, above that 2 and so on.
Four boxes are kept between box B2 and box B6.
Box B2 is kept above box B6.
| | Case 1 | Case 2 |
| Position | Box | Box |
| 7 | B2 | |
| 6 | | B2 |
| 5 | | |
| 4 | | |
| 3 | | |
| 2 | B6 | |
| 1 | | B6 |
The number of boxes kept above box B2 is same as the number of boxes kept below box B4.
Box B4 is not kept at the bottommost position.
Thus, Case 1 gets cancelled.
| | Case 2 |
| Position | Box |
| 7 | |
| 6 | B2 |
| 5 | |
| 4 | |
| 3 | |
| 2 | B4 |
| 1 | B6 |
Two boxes are kept between box B1 and box B5.
Box B7 is kept immediately below box B1.
| Position | Box |
| 7 | B5 |
| 6 | B2 |
| 5 | |
| 4 | B1 |
| 3 | B7 |
| 2 | B4 |
| 1 | B6 |
Now, box B3 is remaining.
| Position | Box |
| 7 | B5 |
| 6 | B2 |
| 5 | B3 |
| 4 | B1 |
| 3 | B7 |
| 2 | B4 |
| 1 | B6 |
This is the final arrangement.
Two boxes are kept below box B7.
Study Notes
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