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Carl has 10 gray, 6 green and 4 orange marbles in a bag. Carl draws one marble randomly, writes down the color and puts it back. Carl repeats the process three more times. What is the probability that Carl selected a gray marble each time?
$\dfrac{1}{8}$
$\dfrac{2}{5}$
$0$
$\dfrac{1}{16}$
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