There are 1,000 balls in a container. All of the balls are the same size and shape. In the container, there are • 400 red balls; • 250 orange balls; • 100 green balls; and • 250 yellow balls. A student will pick one ball at random from the container. What are the probabilities that the student will pick a ball that is either red, orange, or green? Write the three different ways to represent this probability.