Question 328757
The are 10 marble altogether. The prob. of choosing a green on the first draw is 5/10=1/2. Since we do not put it back, there are 9 marbles, 4 of which are green. The second green has prob. 4/9
The third, 3/8

So, the prob. all three are green is (1/2)(4/9)(3/8)=1/12.