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There are 12 sharpened pencils and 9 dull pencils in a pencil case. If two pencils are taken at random without looking, what is

There are 12 sharpened pencils and 9 dull pencils in a pencil case. If two pencils are taken at random without looking, what is the probability that the second pencil is dull, given that the first pencil is sharpened?

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