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5. In a bag, we have 100 identical balls numerated from 1 to 100. We chose 5 at random in a certain order without replacement. Any ball has same probability to get chosen. That means we pick one and then put it on a table. Then we pick a second one and put it on the table behind the first one, then we pick a third one and put it behind the two first....what is the probability that the sequence of 5 numbers we get is in increasing order?