<|im_start|>system
You are a helpful assistant. You first think about the reasoning process in the mind and then provide the user with the answer. You should try to truely solve the question by yourself without cheating.  <|im_end|>
<|im_start|>user
 A class has 5 students participating in the duty roster from Monday to Friday, with one student arranged each day. Among them, student A can only be arranged on Monday or Tuesday, and student B cannot be arranged on Friday. Find the number of different duty arrangements for them. Show your work in <think> </think> tags. And return the final answer in <answer> </answer> tags.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>
user
36
A class has 5 students participating in the duty roster from Monday to Friday, with one student arranged each day. Among them, student A can only be arranged on Monday or Tuesday, and student B cannot be arranged on Friday. Find the number of different duty arrangements for them.
test