A bag with 12 marbles has 3 yellow marbles, 4 blue marbles, and 5 red marbles. A marble is chosen from the bag at random. What is the probability that it yellow? Write your answer as a fraction in simplest form.
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So the probability of choosing a yellow marble is the ratio of the number of yellow marbles to the total number of marbles. The probability is: $$\frac{\text{Number of yellow marbles}}{\text{Total number of marbles}} = \frac{3}{12}$$ Show more…
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