If the probability that an individual suffers a bad reaction from an injection of a given  serum is 0.002, determine the probability that out of 400 individuals
(i) exactly 2
(ii) more than 3
(iii) at least one
 individuals suffer from bad reaction.

(i) The probability of exactly 2 individuals out of 400 suffering from a bad reaction can be calculated using the binomial distribution. The formula for the probability of exactly k successes in n trials is given by:

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