What is the probability that a number selected from number 1 to 30 is prime number,when each of the given numbers is equally likely to be selected?  Choose the correct option:
A) 10 / 30 B) 20 / 30 C) 1 D) 5 / 30 E) 15 / 30

Rationale: x = { 2,3 , 5,7 , 11,13 , 17,19 , 23,29 } n ( x ) = 10 n ( s ) = 30 hence required probability = n ( x ) / n ( s ) = 10 / 30 option a is answer
Answer: A