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
What is the ratio of the sum of the odd integers between 0 and 100, to the sum of the odd integers between 100 and 200? Express your answer as a common fraction.
user
test