Q. The probability that number selected at random from the numbers 1, 2, 3, 4, 5, 6, 7, 8, ……., 100 is a prime, is
A) 0.4
B) 0.25
C) 0.45
D) 0.43
Explanation
(b)
Let $E =$Event of getting prime number from 1 to 100
$= \{ 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97\}$
$\therefore n(E) = 25$
$\therefore$Required probability$= \frac{25}{100} = 0.25$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.