Posted by jake on .
A standard die is rolled three times. What is the probability that a prime number
is rolled on exactly one of the three rolls?

math 
PsyDAG,
Prime = 2, 3, 5
If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events.
Rolling prime = 1/2
Rolling nonprime = 1/2