A number is selected at random from first 30 natural numbers. What is the probability that the number is a multiple of either 3 or 13?
(A) 17/30
(B) 2/5
(C) 7/15
(D) 4/15
(E) 11/30
Difficult Math Question #33 - Probability
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2/5.
10 multiples of 3 and 2 multiples of 13 adding to a total of 12. So the probability is 12/30.
10 multiples of 3 and 2 multiples of 13 adding to a total of 12. So the probability is 12/30.