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An urn contains a number of black and a number of white balls, the ratio of the numbers being 3: 1. It is not known,

An urn contains a number of black and a number of white balls, the ratio of the numbers being 3: 1. It is not known, however, which color ball is more numerous. From a random sample of three elements drawn with replacement from the urn, estimate the probability of drawing a black ball.

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