A sequence is defined below. f(0) = 7
f(n) = 2f(n - 1) - 3 for n > 1, where n is an integer
What is the third number in the sequence?

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?