Simplify the expression $\sqrt{7!}$, where $n!$ stands for $n\cdot(n-1)\cdot(n-2)\cdots \cdot 2\cdot 1$.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Simplify the expression $\sqrt{7!}$, where $n!$ stands for $n\cdot(n-1)\cdot(n-2)\cdots \cdot 2\cdot 1$.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
12\sqrt{35}
Simplify the expression $\sqrt{7!}$, where $n!$ stands for $n\cdot(n-1)\cdot(n-2)\cdots \cdot 2\cdot 1$.
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