statistics/probability

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in testing a new drug. researchers found that 20% of all patients using it will have a mild side effect. a random sample of 14 patients using the drug is selected. find the probability that:
a) exactly three will have mild side effects.
b) at least four will have this mild side effect.

*once again the more i work with numbers the more i get confused. please show calculations in detail. thank you.

mary hornbeck

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