IMO Shortlist 1967 problem 2


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2. travnja 2012.
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An urn contains balls of k different colors; there are n_i balls of i-th color. Balls are selected at random from the urn, one by one, without replacement, until among the selected balls m balls of the same color appear. Find the greatest number of selections.
Izvor: Međunarodna matematička olimpijada, shortlist 1967