A factory produces fuses, which are packaged in boxes of 25. Eight fuses are selected at random from each box for inspection. The box is rejected if at least one of these eight fuses is defective. What is the probability that a box containingnine defective fuses will be rejected?
An urn contains seven red balls and four white balls. A sample of 3 balls is selected at random from the urn. What is the probability that at least one of the balls is red?
In a classroom of children (18 boys and 14 girls), four students are chosen to go to the blackboard. What is the probability that no boys are chosen?
Without consultation, each of five organizations announces a one-day convention to be held during July. Find the probability that at least two organizations specify the same day for their convention.
An airport limousine has five passengers and stops at six different hotels. What is the probability that two or more people will be staying at the same hotel? (Assume that each person is just as likely to stay in one hotel as another.)