Evaluate $\sqrt{3\cdot6\cdot10\cdot15\cdot21\cdot28}$.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Evaluate $\sqrt{3\cdot6\cdot10\cdot15\cdot21\cdot28}$.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
1260
Evaluate $\sqrt{3\cdot6\cdot10\cdot15\cdot21\cdot28}$.
train