Enter the value of n for the equation ​

Consider the graph of the exponential function y=3(2)×

The number if marbles of different colors stored in a hat is listed below: 4 red marbles 10 green marbles 7 blue marbles. without looking in the hat, dan takes out a marble at random. he replaces the marble and then takes out another marble from the hat. what is the probability that dan takes out a blue marble in both draws?

Me. i can't figure out this question. give an explanation too. .