Re: HSC 2016 2U Marathon
a, b, c form an AP with a sum of 9
and then in a different order they form a GP (I *think* it was b, c, a)
I didn't read that bit, and just thought that a,b,c was an AP and a GP and solved it like above and proved it was 3,3,3
but it wasn't :(
oh well, it was out of...