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

b , 2/5

Explanation:

Prime no. is no. that has only 2 factor so b/n 1 and 20 the prime no. are 2, 3, 5, 7, 11, 13, 17, 19 so they are 8 in no.

The probablity will be 8/20 = 2/5 so the answer is b