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How this works is when a variance of probability isn't replaced then it reduces total fractional amount as a probability.

So the first trial would be 4/12=blue
(12 because the total units involved is 12)
This can be simplified as 1/3 one third

Since is it not replaced then the total amount will decrease as well as the variant deducted.

So the second trial would be 8/11=yellow

Strangely enough this increases the probability of the yellow because there are less variables.

To complete the process you need to connect these two trials together, this is where you would multiply.

4/12 x 8/11 = 32/132 you would simplify this by dividing by the highest that can go into the numerator and the denominator which is 4 = 8/33 this would be your final answer.

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