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Martha is a flight attendant stationed in Denver. Her assignments are rotated randomly between flights to Portland, Boise, and Las Vegas. For this problem, consider

Martha is a flight attendant stationed in Denver. Her assignments are rotated randomly between flights to Portland, Boise, and Las Vegas. For this problem, consider a success being a trip to Las Vegas in the next five assignments. What is the probability that Martha will fly to Las Vegas exactly twice?

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