1) What is the probability that the last three digits of a randomly selected phone number are all prime? Express your answer as a common fraction
2) The sum of the digits of a number is 9. What is the probability that the number is prime?
1) What is the probability that the last three digits of a randomly selected phone number are all prime? Express your answer as a common fraction
2) The sum of the digits of a number is 9. What is the probability that the number is prime?