A number is selected at random from the set Y = {18, 19, 20, . . . 28, 29}. Find the probability that the number is prime.
-
A.
(frac{1}{4}) -
B.
(frac{3}{11}) -
C.
(frac{1}{2}) -
D.
(frac{3}{4})
Correct Answer: Option A
Explanation
Y = {18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29}
Number of prime numbers = 3
Prob(picking a prime number) = (frac{3}{12})
= (frac{1}{4})