Answer:
1/12.
Step-by-step explanation:
There are a total of 9 marbles so
Prob(drawing first a green) = 3/9.
After drawing the green there are 8 marbles left in the bag, so:
Prob(drawing a red) = 2/8.
The required probability = 3/9 * 2/8
= 1/3 * 1/4
= 1/12.