A bag contains 10 red marbles and 20 white marbles. You draw a marble, keep it, and draw another. What is the probability of drawing two red marbles?

Answer 1

3/29

Answer 2

first red --> 10/30
second red --> 9/29

prob of 2 red = (10/30)(9/29) = 3/29

Answer 3

10/30*9/29
3/29