The sample space of an experiment is S = {1,2,3}. Each outcome is equally likely to occur with a probability of 1/3. What is the probability of picked number 2 or 3? Write your answer in the simplest form of a fraction.

Since each outcome is equally likely to occur with a probability of 1/3, the probability of picking number 2 or 3 is:

P(2 or 3) = P(2) + P(3) = 1/3 + 1/3 = 2/3

Therefore, the probability of picking number 2 or 3 is 2/3.