Question

What is the probability of rolling a prime number of a standard 20-sided die? (1 is not a prime number.) a. 7/20 b. 2/5 c. 9/20 d. 1/2

Answer 1

2/5.

Explanation:

The prime numbers from 1 to 20 are 2, 3, 5, 7, 11, 13, 17 and 19.

A total of 8.

So the probability of rolling a prime number is 8/20

= 2/5.