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A bag contains 20 balls numbered 1 to 20. One ball is drawn at random. Find the probability that it is marked with a number which is a multiple of 5 or 7.
Total Number of Balls = 20
Number of balls that are multiple of 5 and 7 are = 5, 7, 10, 14, 15, 20 = 6
P(probability that it is marked with a number which is a multiple of 5 or 7) =
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