If a publisher of nontechnical books takes great pains to ensure that its books are free of
typographical errors, so that the probability of any given page containing at least one such error is 0.005
and errors are independent from page to page,
a. What is the probability that one of its 400-page novels will contain exactly one page with errors?
b. What is the probability that one of its 400-page novels will contain exactly one page with errors
given that it contains at least one page with errors?
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