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Paul has 10 red, 9 gray and 8 orange marbles in a bag. Paul draws one marble randomly, writes down the color and puts it back. Paul repeats the process three more times. What is the probability that Paul selected a gray marble each time?
$0$
$\dfrac{1}{81}$
$\dfrac{16}{27}$
$\dfrac{7}{8}$
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