Question: find the probability of getting the sum as a prime number when two dice are thrown together?
Answer: There is 1 way to get 2, 1 way to get 3, 2 ways to get 5, 3 ways to get 7, and 1 way to get 11. That makes 8 ways to get a prime number, out of 21 possible outcomes. So 8/21 is the probability of getting a prime. Prime numbers that can be the sum of two fair, 6-sides dice are limited to the range of 2–12.