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An urn contains n balls, of which one is special. Of these balls,k balls are to be randomly selected, where1 < k < n. The

An urn contains n balls, of which one is special. Of these balls,k balls are to be randomly selected, where1< k < n. The k balls are withdrawn one at a time, with each selection being equally likely to be any of the balls that remain at the time. Show using conditional probabilities that the probability of selecting the special ball by drawing sequentially k out of n balls from an urn in a sequential manner is k/n

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