The probability of a second marble selected being green is 2:15, I’m pretty sure. If one green marble was taken from the bag and not replaced, then there are 2 green marbles left. There are 13 total marbles left in the bag (that aren’t green, and based on what they have told us in the problem so far), and 2+13 is 15. So, there is a 2 out of 15 marbles chance of selecting a green marble. I think that’s right.