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On a shelf there are 60 novels and 20 poetry books. Person A randomly picks a...

On a shelf there are 60 novels and 20 poetry books. Person A randomly picks a book from the shelf and takes it away. Then another person B chooses another book at random.
to.

a. What is the probability that B's selected book is a novel?
b. If B is known to have chosen a novel, what is the probability that A's selected book is poetry?

Math   Statistics-And-Probability   
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