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5 September, 10:18

An urn contains 4 white and 4 black balls. we randomly choose 4 balls. if 2 of them are white and 2 are black, we stop. if not, we replace the balls in the urn and again randomly select 4 balls. this continues until exactly 2 of the 4 chosen balls are white. what is the probability that we have to repeat this process exactly n times?

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  1. 5 September, 10:36
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    I don't really know but I think it is 4 times
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