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Julia has 8 pink, 4 blue and 4 white marbles in a bag. Julia draws one marble randomly, writes down the color and puts it back. Julia repeats the process one more time. What is the probability that Julia selected a blue marble each time?
$\dfrac{1}{2}$
$\dfrac{3}{4}$
$\dfrac{1}{16}$
$\dfrac{3}{16}$
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