The odds of not drawing a green marble are 19/23.
This is because we know that we have 23 total marbles (7 + 4 + 3 + 9 = 23). We also know that there are only 4 green ones. So this leaves us with only 19 non-green marbles of the 23 that could be chosen. Therefore, we can express our odds by dividing the total goal grouping by the overall number.
19/23