An allergist claims that 50% of the patients she tests

An allergist claims that 50% of the patients she tests

An allergist claims that 50% of the patients she tests are allergic to some type of weed. What is the probability that
(a) Exactly 3 of her next 4 patients are allergic to weeds?
(b) None of her next 4 patients is allergic to weeds?

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