Probability of Drawing Red or Blue Marble

Medium Data Analysis And Probability Probability

A bag contains 12 marbles: 4 red, 5 blue, and 3 green. If a marble is drawn at random from the bag, what is the probability that it is either red or blue?

$$\frac{4}{12}$$

$$\frac{3}{12}$$

$$\frac{9}{12}$$

$$\frac{5}{12}$$

Hint

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