Six boxes - J, K, L, M, N and O are arranged one above the other in the stack, but not necessarily in the same order. The bottommost stack is numbered as 1 while the topmost stack is numbered as 6. No two boxes are arranged in the same stack.
Atleast three boxes are kept between box L and box N.
Box O is kept immediate below box L.
| Case 1 | Case 2 | Case 3 | Case 4 |
| Boxes | Boxes | Boxes | Boxes |
| Stack 6 | L | | L | N |
| Stack 5 | O | L | O | |
| Stack 4 | | O | | |
| Stack 3 | | | | |
| Stack 2 | N | | | L |
| Stack 1 | | N | N | O |
Two boxes are kept between box J and box O. Thus, case 1 and case 2 are invalid.
| Case 3 | Case 4 |
| Boxes | Boxes |
| Stack 6 | L | N |
| Stack 5 | O | |
| Stack 4 | | J |
| Stack 3 | | |
| Stack 2 | J | L |
| Stack 1 | N | O |
Box K is kept on an even-numbered stack.
Thus, case 4 is invalid.
Therefore, the final arrangement is:
| Boxes |
| Stack 6 | L |
| Stack 5 | O |
| Stack 4 | K |
| Stack 3 | M |
| Stack 2 | J |
| Stack 1 | N |
Box J is kept immediate below box M.
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