A number is selected at random from the numbers 1 to 30. What is the probability that the selected nummber is a prime number ?
(a) $\frac{2}{3}$ (b) $9 \frac{1}{6}$ (c) $\frac{1}{3}$ (d) $\frac{11}{30}$

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Solution

Prime numbers between 1 and 30 are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29. The probability that the number chosen from 1 to 30 is a prime number = 10/30 = 1/3

answer:- (c) 1/3

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