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Probability
A ball is selected at random from a box. If the box has 9 white, 8 green, and 3 orange balls, what is the probability that the ball selected is not orange?
Explanation and memory cue
The total number of balls is 9 + 8 + 3 = 20. The number of balls that are not orange is 9 + 8 = 17. Therefore, the probability of selecting a ball that is not orange is 17/20.