THE MILK BOTTLE PROBLEM

Below, you can see a 6 x 4 milk-crate.

You have to fit 18 bottles into it. Each space can only hold one bottle. The restriction is that every row, and every column, must have an even number of bottles in it.

The problem has been solved by Adam Veli in Year 10.
You will have to keep clicking on NEXT to see the solutions.

Click here for a hint.