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Christina has 4 white, 6 blue and 10 gray marbles in a bag. Christina draws one marble randomly, writes down the color and puts it back. Christina repeats the process one more time. What is the probability that Christina selected a blue marble each time?
$\dfrac{1}{20}$
$\dfrac{9}{100}$
$\dfrac{4}{5}$
$\dfrac{7}{10}$
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