x, y, and z are all unique numbers. If x is chosen randomly from the set {8, 9, 10, 11} and y and z are chosen randomly from the set {20, 21, 22, 23}, what is the probability that x and y are prime and z is not? Choose the correct choice from the following choices:
A) 1/16  B) 3/11  C) 13/20  D) 3/10  E) 1/10
P(x is prime) = 1/4   P(y is prime) = 1/4   If y is prime, then z is not prime since y and z are unique.   Then the probability is 1/4*1/4 = 1/16   The answer is 1/16.
<result>A</result>
x, y, and z are all unique numbers. If x is chosen randomly from the set {8, 9, 10, 11} and y and z are chosen randomly from the set {20, 21, 22, 23}, what is the probability that x and y are prime and z is not?