Summing the rolls of 2 fair dice, what's the probability of rolling a prime number (so rolling a 3 and a 3 doesn't work because 6 is composite)?
1 Answer
Apr 20, 2017
Explanation:
Let's look at the problem this way - what are the possible rolls with 2 fair, standard dice. I'll highlight the prime numbers in red:
Of the 36 possible rolls, 15 are prime, which gives us