Studying the population of kangaroo rats

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A biologist is studying the population of kangaroo rats in a certain desert region. This region is isolated from the rest of the desert by roads, which the rats cannot cross. She knows that there are 1000 total kangaroo rats in this region. Previously she had captured 30 rats from this region, tagged them, and released them again into the region. Today she captures 40 rats at random. Assume that the newly captured rats are equally likely to be any set of 40 of the rats, so, for example, a rat that had been captured before did not learn how to avoid being captured again. What is the probability that exactly a: of the newly captured rats were previously tagged

Reference no: EM133289845

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