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According to an article in the February 1991 issue of Reader's Digest, Americans face a 1 in 20 chance of acquiring an infection while hospitalized.

According to an article in the February 1991 issue of "Reader's Digest", Americans face a 1 in 20 chance of acquiring an infection while hospitalized. If the records of 30 randomly selected hospitalized patients are examined, find the probability that exactly two of them developed an infection.

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