Mathematics, 27.02.2020 01:46 janelisse199820

An urn contains n red balls and m blue balls. They are withdrawn one at a time until a total of r, r ≤ n, red balls have been withdrawn. Find the probability that a total of k balls are withdrawn. Hint: A total of k balls will be withdrawn if there are r − 1 red balls in the first k − 1 withdrawals and the kth withdrawal is a red ball.

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An urn contains n red balls and m blue balls. They are withdrawn one at a time until a total of r, r...

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