Subject: mathqa
Question: the set s consists of 5 numbers : { 1 , 2,3 , 4,5 } . if all possible subsets including the null set are created and one subset is chosen at random , what is the probability that the subset has 4 or 5 as its largest number ?
Option: 
A: 3 / 4
B: 2 / 3
C: 5 / 8
D: 1 / 2
Answer: A