We can't answer that without knowing what else is in the bowl.
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it is 6/9 simplifyyou get 2/3.
The probability of choosing a green marble from this jar would be 6/15. You get this answer by adding up the sum of all the marbles.
There are 15 blue marbles, 8 yellow marbles and 27 red marbles for a total of 50 marbles. Since there are no green marbles in the lot, It is impossible to pull a green marble from the lot. The is no probability whatsoever! "There just ain't no green ones to pull."
sure chance
There are 8 marbles that aren't black, out of a total of 12 marbles, so the probability is 8/12 or 2/3.