# A bag contains 5 red, 8 green and 7 white balls. One ball is drawn at random from the bag. What is the probability of getting a white ball or a green ball?

Total numbers of elementary events are: 5+8 + 7 = 20

Let E be the event of getting a green ball or a white ball

Total numbers of favorable outcomes are: 8+ 7 = 15

P (white or green ball) = P (E) = 15/20 = 3/4

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