Question 1195890
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The answer from @MathLover makes no sense, since there are not 16 marbles to choose from on all three draws.<br>
The solution from @ikleyn uses (correctly!) a basic elementary method for solving the problem, considering the probabilities that each marble selected in succession is green.<br>
Here is another basic method for solving the problem, which will be needed when the problems get more complicated.<br>
P = (number of ways of selecting 3 green marbles and no others) divided by (total number of ways of selecting 3 of the 16 marbles):<br>
{{{(C(5,3)*C(8,0)*C(3,0))/C(16,3)=((10)(1)(1))/560 = 1/56}}}<br>
ANSWER: 1/56<br>
If you are studying probability, you should be familiar with (and comfortable with) both of those basic methods.<br>