Question

DU
What is the probability of getting a prime number from the set of natural numbers
from 1 to 20? ​

Answer 1

The prime numbers are 1, 3, 5, 7, 11, 13, 17, and 19. The amount of prime numbers in this set is 8, and the total amount of numbers in the set 1:20 is 20.

Answer 2

Prime numbers from 1 to 20 = 2, 3, 5, 7, 11, 13, 17, and 19.

Therefore, no. of prime numbers from 1 to 20 = 8

Then, probability of getting a prime number from 1 to 20 =

$\frac{8}{20}$

$= \frac{2}{5}$