Yeh I think the questions this year were easier to understand than last years, bbut I'm shockin with "prove that" questions so that takes me out of the game. I'm pretty happy though, I'm pretty sure the first question was right, the one with the numbers around the circle I got 1 arrangement?, the two questions with the polyhedron/tetrahedron I had no clue how to show it. Also, how did you prove the equation that had k, m and n in it? I'm guessing subbing in a couple of numbers and a paragraph explanation doesnt do the job?
Anyway, I'm tryin to remember the questions, post solutions if you think you got em haha
1. The number of snaps on a chocolate bar
2. The arrangement around the circle 1, 2, 3 ... 2n
3.

4. The consecutive 18 numbers
5. Sum of the digits of 9n
6. The convex tetrahedron intersecting at x and y
7.

, where p=prime number and c and n are both >1
8. The polyhedron that haad different sized areas with a sphere inside
I think i got 1, some of 2, some of 3, some of 5, some of 8???
Oh well, all over for another year