Question: A graphic designer makes a presentation to clients and this results in sales of her services in one-fourth of the cases. Assuming the results for

A graphic designer makes a presentation to clients and this results in sales of her services in one-fourth of the cases. Assuming the results for different clients are independent
(a) Find the probability that exactly 3 of the next 4 presentations result in sales.
(b) Find the probability that none of the presentations result in a sale.

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