21
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
In how many ways can George choose two out of seven colors to paint his room?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
21
In how many ways can George choose two out of seven colors to paint his room?
train