If I draw at random from a set of 50 numbers( say 1:50), five numbers without replacing the drawn number, and then repeat this process ten times starting each 'draw' from the full set, how likely is it that I will draw every number of the set? How do I calculate this? Would it be 50( the number of 'draws') divided by 500 ( the total number from which the draws were taken) i.e.10% or is it more complicated than this?