Write the first five terms of each of the following recursively defined sequences:
an+1 = 2(an)^−1, a1 = y, (y ≠ 0) write each term in the form kxn.

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?