1. Two events A and B are investigated: P(A)=0.35, P(B)=0.72, the percent chance that at least one of event A or B occur is 90%; What is the probability that only one of the events happens is?
2. ) Four couples are randomly sat in a row. The number of different ways for all the couples to sit together is?
3. ) An urn contains 3 balls number 1 to 3. Two balls are drawn with replacement. Let X be the value of larger of the two numbers drawn. P(X=2) =
4. A group of people is divided into 18 male and 23 female options then randomly mixed. If you take a handful of 5 people, the probability of at most 4 being male is?
5. Two fair-die are tossed. If at least one die is odd, then the probability that the uppermost-faces' absolute difference is 2, is =