6. Someone plans to travel at the weekend. According to the weather forecast, the probability of raining on the first and the second day of weekends is 0.5 and 0.3 respectively, the probability of raining on both days is 0.2. Try to find: (Let A; be event of raining on the ith day, i = 1,2, then P (A₁) = 0.5, P (A2) = 0.3, P (A1 A2) = 0.2.) (1) The probability of raining on the first day but not on the second day; (2) The probability of raining on one of the two days; (3) The probability of raining at least on one day.

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