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A bag of 13 marbles contains 5 marbles with red on them, 4 with blue on them, 7 with green on them, and 3 with

A bag of 13

marbles contains 5

marbles with red on them, 4

with blue on them, 7

with green on them, and 3

with red and green on them. What is the probability that a randomly chosen marble has either green or red on it? Note that these events are not mutually exclusive. Express your answer as a fraction in lowest terms or a decimal rounded to the nearest millionth.

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