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Brandon has 8 gray, 6 pink and 10 blue marbles in a bag. Brandon draws one marble randomly, writes down the color and puts it back. Brandon repeats the process two more times. What is the probability that Brandon selected a gray marble each time?
$\dfrac{1}{24}$
$\dfrac{2}{27}$
$\dfrac{1}{27}$
$\dfrac{2}{3}$
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