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In a box of 50 markers, 30 markers are either red or black and 20 are missing their caps. If 12 markers are either red

In a box of 50 markers, 30 markers are either red or black and 20 are missing their caps. If 12 markers are either red or black and are missing their caps, find the probability that a randomly selected marker is red or black or is missing its cap.

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