Just one thing TPH... I don't know about the American and English schools, but here in SA we don't do partitions and the combinatorics formula in school. So that's a completely unknown section of mathematics for someone like me. I'll probably only do those things next year when I get to university.
But thanks for the elementary probs, they're cool
Yeah we don't do them in WA either. I am blissfully ignorant of their existence ... atm