A number is selected randomly from the set of integers 1 to 20 inclusive. What is the probability that the number is either a multiple of 3 or a multiple of 5?
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A number is selected randomly from the set of integers 1 to 20 inclusive. What is the probability that the number is equal to or greater than 15?
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The propability that a number selected at random from 1 to 40 is a multiple of 7 is?