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In a scientific study there are 8 guinea pigs, 4 of which are pregnant. If 3 are selected at random without replacement, find the probability

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In a scientific study there are 8 guinea pigs, 4 of which are pregnant. If 3 are selected at random without replacement, find the probability that all are pregnant. Enter your answer as a fraction or a decimal rounded to 3 decimal places. P (3 are all pregnant) =

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