Evaluate $\left|\dfrac{2-4i}{2+i}\right|$.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Evaluate $\left|\dfrac{2-4i}{2+i}\right|$.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
2
Evaluate $\left|\dfrac{2-4i}{2+i}\right|$.
train