This appeared on a nature of proof topic test btw :skip:.
I don't have access to the solution.
Edit: I ended up proving it using induction and manipulation of the bounds
I'm in year 11 right now, starting year 12 next term. I'm really stuck on whether or not I should do extension 2 maths, and the application deadline is next Friday. So far in extension 1, I've done well, ranking 2/43 with the help of an external tutoring firm. However, because of financial...