There are 100 numbered balls in an urn. We make 100 random draws with replacement. Of course, we can not expect to draw every number exactly once, there will be multiples. What is the expected value of multiply drawn numbers?
I asked this question before (expect number of multipe draws), but the obtained answer does not seem to be correct.
For a deeper understanding think of just 2 balls and 2 draws: Then the probability of multiples is 50%. The answers given so far focussed on the probability that a fixed number is drawn at least twice, which is 25%.