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Frank has 3 gray, 9 pink and 6 blue marbles in a bag. Frank draws one marble randomly, writes down the color and puts it back. Frank repeats the process one more time. What is the probability that Frank selected a blue marble each time?
$\dfrac{4}{5}$
$\dfrac{1}{9}$
$\dfrac{2}{3}$
$0$
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