Jackie rolls two fair, six-sided dice. You are not told what the rolls were, but you are told that the sum of the two rolls is a prime. What is the probability that the sum of the two rolls is 5?
Possible
primes. Die 1. Die 2.
2. 1. 1
3. 1. 2
2. 1
5. 1. 4
4. 1
2. 3
3. 2
7. 1. 6
6. 1
2. 5
5. 2
3. 4
4. 3
11. 5. 6
6. 5
There are 4 ways to make 5 out of 15 ways to make a prime.
Wait, so 4/5 of 15 ways. That's 4/75, and I've already tried the answer before.
Ohhhh, sorry, my brain is not working today. Thanks for teaching me and letting me understand!