Probability & Combinations( Week 49 Practice) 1. A bag contains 22 marbles: 7 red, 9 green, and 6 yellow. What is the probability of pulling a yellow one from the bag?(Express your answer as a fraction to the lowest terms) 2. You have 6 one-cent stamps and 2 five-cent stamps. Using at least one stamp from each type, how many different amounts of postage can you make? 3. The ratio of red balls to blue balls in a bag is 6 : 7. A ball is randomly picked from the bag. What is the probability that the ball picked is a red one? 4. It is a picture day. There are 5 girls and 4 boys in a class. Every two girls will take a photo and every two boys will also take a photo. How many photos will be taken for the entire class? 5. 4 students line up. How many possible ways can they line up in? |