You roll a 6-sided die. What is P(not factor of 15)? Write your answer as a percentage.

Question

what is the probality of not a fcator of 15

Answer 1

you could roll a 3 or a 5, each of which is a factor of 15.  (I exclude 1, which isn't a factor properly because it's not in the unique prime factorization of any number.

 

so what's the probability of rolling a 3 or 5?  Answer: 1/3