Question

If four identical dice are rolled, probability that sum of numbers on them will be a prime is?

Answer 1

9/ 21    is the probability of getting  a prime sum

1. total possible outcomes (sample space)= ( 4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24)
2. this gives us all the values that are possible when the die are rolled
3. prime numbers among them= (2,3,5,7,11,13,17,19,23)
4. probability that sum is prime = 9/21