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4. There are rooms from 101 to 550 inclusive in which the starting rooms are numbered from 1, 2, 3 and the waiting rooms are numbered from 4,5,6. What is the probability that the rooms 4, 5, 6 will be choosed randomly?
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08/24 22:12, , 1F
08/24 22:12, 1F
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08/24 22:29, , 2F
08/24 22:29, 2F
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