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Justin has 9 blue, 5 pink and 4 yellow marbles in a bag. Justin draws one marble randomly, writes down the color and puts it back. Justin repeats the process three more times. What is the probability that Justin selected a blue marble each time?
$\dfrac{1}{18}$
$\dfrac{1}{2}$
$\dfrac{1}{16}$
$\dfrac{1}{8}$
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