We’re taking you back to school this edition with some fiendish maths problems (well, to me at least – to you they may be a breeze!) Dust off your arithmetic and geometry skills and try your hand at the Riemann Hypothesis. Just kidding with that last one – it’s considered the most difficult maths problem there is and there’s a USD one million prize for solving it. What we can promise is USD100 vouchers to three lucky winners who manage to answer all 15 questions below correctly! Winners to be announced on Karma Group and Karma Concierge Channels on 19 December.