Correct Answer: Option D
Here, S = {1, 2, 3, 4, ...., 19, 20}.
Let E = event of getting a multiple of 3 or 5
= {3, 6 , 9, 12, 15, 18, 5, 10, 20}.
So, P(E) = n(E)/ n(S) =9/20.
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