<|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 school is forming a team for a debate competition, selecting 4 members from 6 students to serve as the first, second, third, and fourth debaters. If student A must participate and cannot be the fourth debater, then the number of different possible arrangements is ______ (provide the result numerically). 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
180
A school is forming a team for a debate competition, selecting 4 members from 6 students to serve as the first, second, third, and fourth debaters. If student A must participate and cannot be the fourth debater, then the number of different possible arrangements is ______ (provide the result numerically).
test