Question

From the natural numbers 1 to 17. One number is randomly selected. Find the probability that number is prime.

Answer 1

Sample space of nos. 1 to 17.

S = {1,2, 3, 4,5,6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17}

E = (1, 3, 5, 7, 11, 13, 17}

Thus, n(S) = 17 and n(E) = 7

Thus required probability

P(E) = n(E)/n(s) = 7/17