Two fair 6-sided dice are rolled. What is the probability that either the sum is 3 or the sum is 8?

 

36 sums are possible. Because there are 2 ways to get a sum of 3, the probability for this event is . Because there are 5 ways to get a sum of 8, the probability for this event is .

The probability of rolling a sum of 3 or 8 is about 0.194 or 19.4%.