48% of all violent felons in the prison system are repeat offenders. If 40 violent felons are randomly selected, find the probability that   a. Exactly 18 of them are repeat offenders. b. At most 18 of them are repeat offenders. c. At least 18 of them are repeat offenders. d. Between 17 and 21 (including 17 and 21) of them are repeat offenders.

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