In each trial of an experiment, an error occurs with probability 0.15. An error is a major error with probability 0.2 and a minor error with probability 0.8. The experiment is repeated 12 times, and trials are independent of one another. (a) What is the probability that an error occurs in exactly 4 of the trials? (b) What is the probability that exactly 3 minor errors occur? (c) What is the probability that exactly 2 minor and 2 major errors occur? (d) What is the number of times the

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