Hi all, I realise this question is related to convolutions and no longer part of the examinable material, but was wondering (for those who have the older study notes) how the probabilities were derived for instances where S=0,1 (being 1/40, 1/20 respectively) and how the limits of the integral became {10-s,10} instead of {10-s,20} for the case where 10<= S <= 20. Thank you
