A bag contains 7 red marbles, 8 blue marbles and 5 green marbles. If two marbles are drawn out of the bag, what is the probability, to the nearest 10th of a percent, that both marbles drawn will be green?
The probability that the first marble is green: 5/20
The probability that after drawing the first green marble, the second marble will also be green: 4/19
The total probability: 5/20 x 4/19 = 20/380 = 0.0526 (you can round this answer)