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Sharon has 5 green, 10 gray and 6 pink marbles in a bag. Sharon draws one marble randomly, writes down the color and puts it back. Sharon repeats the process one more time. What is the probability that Sharon selected a pink marble each time?
$\dfrac{2}{3}$
$\dfrac{16}{21}$
$\dfrac{5}{7}$
$\dfrac{4}{49}$
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