The records of commercial flights showed that the probability of an aircraft leaving on time is 0.85, the probability of a plane arriving on time is 0.75, and the probability that a plane departs and arrives on time is 0.6. If it is known that an airplane departed on time, then the probability that the airplane will arrive on time is 1. O 0.6 2. O 0.8 3. O 0,7 4. O 0.9

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A:

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