Here is a question that is puzzling me:
A bag contains a large number of marbles; the numbers of the red, blue and yellow marbles are in the ratio $3:4:5$. Four marbles are randomly drawn without replacement. What is the probability that you will draw $1$ red marble, $2$ blue marbles and $1$ yellow marble?
The answer should be $0.0694$ (could potentially be rounded off a bit).
Okay, here is where I am confused. If they gave us, instead of the ratios that there were $3$ reds, $4$ blues and $5$ yellows and we are drawing without replacement that would be simple, but I am just not sure how to look at this. A fellow classmate said that a clue could be that, because they're in ratio and there's a "large number" of marbles, the probabilities would stay the same even after picking a marble, which I now understand,but still cannot reach the answer using this information.
Thank you in advance for your help :)