In a group of 25 students at lunch, 10 prefer ketchup on their hamburger, 10 prefer mustard on their hamburger, and 5 like both ketchup and mustard. What is the probability that a student selected from this group will prefer ketchup or mustard on their hamburger? A card is randomly selected from a standard deck of 52 cards. What is the probability that is 2 or an 8? In a class of 50 high school juniors, 32 students either play a sport or are in the marching band. There are 22 juniors who play a sport and 16 who are in the marching band. What is the probability that a randomly selected junior plays a sport and is in the marking band? You roll a die. What is the probability that you roll an even number or a 5? You roll a die. What is the probability that you roll an odd number or a factor of 6.