Question: 18. A number is selected at random from the set {1, 2, . . . , 10,000} and is observed to be odd. What is

18. A number is selected at random from the set {1, 2, . . . , 10,000} and is observed to be odd. What is the probability that it is

(a) divisible by 3;

(b) divisible by neither 3 nor 5?

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