two cards are drawn without replacement from an ordinary​ deck

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Two cards are drawn without replacement from an ordinary​ deck, find the probability that the second is not a queen​, given that the first is a queen.

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You should be able to do it yourself. There are 51 cards remaining and 3 queens. If the cards are strictly random the probability of a queen is 3/51=1/17, so the probability of not a queen is 16/17.