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Denise has 7 orange, 9 yellow and 5 gray marbles in a bag. Denise draws one marble randomly, writes down the color and puts it back. Denise repeats the process three more times. What is the probability that Denise selected a orange marble each time?
$\dfrac{1}{21}$
$\dfrac{2}{3}$
$0$
$\dfrac{1}{81}$
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