Here is the question:
Okay, looks a bit scary. Let's break it down:
>Decagon
>Moving circle
>Circle shifts from white to grey
Fantastic. Because the circle is shifting colours, we can see there is a 3-2 pattern. This means that one of the 3 will have to be in the middle. Visual representation shown.
This puts us in a good position. Now, let's find the pattern of the moving circle. To do this, draw a rough image of the decagon, and track where the circles are.
Now,
THIS is your starting point. Try to find a pattern going from
red to
blue to
red to
blue to
red. I hope that makes sense, haha. This is the best 'starting point' you'll get. Just pick any red one.
You said you've got the method down after this, so I'll leave it to you to give it a go
If you don't wish to try (I mean, I'm no expert haha) or once you have an answer, I'll post the answer + solution. Good luck!