If $*$ represents an operation defined by $a*b=a^b+b$, find $(1*2)*3$.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
If $*$ represents an operation defined by $a*b=a^b+b$, find $(1*2)*3$.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
30
If $*$ represents an operation defined by $a*b=a^b+b$, find $(1*2)*3$.
train