1. Let A, B be random events, and then the event that both of them occur is. 2. Let A, B, C be random events, and then the event that at least two of them occurs is.
3. Suppose A, B are exclusive events, P(A) = 0.6, P(A-B) = 0.2, and then P((AB)’) equals.
4. Let A, B, C be random events, P(A) = P(B) = P(C) = 0.25, P(AC) = P(AB) = P(BC) = 0.15, P(ABC) = 0.05, then the probability of the event that at least one of A, B,C occurs equals.
5. Suppose there are 5 black and 3 white balls inside a bag which you cannot see the colors from outside, taking two of them out at random, the probability that these two balls are of different colors equals.