You will be shown 10 random numbers between 1 and 100 without knowing what's next. Your task is to put them in order! But beware, if a number cannot be placed, the quiz ends...
Your source claims to get its numbers from the UN, but the UN numbers don't agree with your list. According to http://unstats.un.org/unsd/demographic/products/dyb/dyb2014/Table08.pdf, Nairobi should be on your list.