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Probabilities of Ramesh using car, scoot...

Probabilities of Ramesh using car, scooter, bus and train are 1/7, 2/7, 3/7 and 1/7 respectively. Probabilities of him reaching office late with these vehicles are 2/9, 4/9, 1/9 and 1/9 respectively. If he reaches office on time, find the probability that he went by car.

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