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3. In a large town, one person in 80, on average, has blood type X. How many donors must be taken at random in order

3. In a large town, one person in 80, on average, has blood type X. How many donors must be taken at random in order that the probability of including at least one donor of type X shall be 0.9 or more? Use Binomial and Poisson distribution respectively and compare the results.

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