Question

A pharmaceutical company through an advertisement in a magazine, estimates that 1% of the
subscriber will buy products. They also estimated 5% of nonsubscriber will buy the product
and that there is one chance in 20 that person is a subscriber.
a) If a person buys the product what is the probability he subscribes to the magazine?
b) If a person does not by the product what is the probability he subscribes to the magazine?
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Answer 1

Answer:

b I think is the answer not sure though