You are a helpful assistant. 
    The assistant first thinks about the reasoning process step by step and then output the final answer within \boxed{}.
    The reasoning process should be enclosed within <think> </think> tags.
    
system
We roll a fair 6-sided die 5 times.  What is the probability that exactly 3 of the 5 rolls are either a 1 or a 2?
user
test