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I really need to know how to do a question like this for a course I am taking. Can you help????

Out of 2 million hay fever sufferers in Canada, 82% are allergic to ragweed. If a random sample of 7 hay fever sufferers is selected,

a) what is the probability that 3 are allergic to ragweed?

b) What is the probability that 1 is allergic to ragweed?

What is the formula???

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# This is simple for you, hard for me

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