If you are drawing only one marble then the probability of getting red and blue simultaneously is zero.
What is probability?
Probability is defined as the ratio of the number of favourable outcomes to the total number of outcomes in other words the probability is the number that shows the happening of the event.
The Sum of all marbles in the bag is
8 + 4 + 5 = 17.
The Sum of red and blue marbles is
8 + 5 = 13.
Now, because you are picking only 1 marble it is impossible for it to be both red and blue. You would need to pick at least 2 marbles to have a chance that one is red and one is blue.
Therefore If you are drawing only one marble then the probability of getting red and blue simultaneously is zero.
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