If you roll both jars once the probability of getting two greens is zero, because there are no greens in the first jar.
If you roll the second jar twice the probability of getting a green twice is, i think, 11.10%, my math is based off the first probability of getting a green which is 33%
times the probability of getting a second green 33%
33.33% * 33.33% = 11.108889%
