
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
A school has 6 different computer rooms, and at least 2 rooms are open every evening. The task is to find the number of different arrangement plans. Four students provided the following four results:  
① $C_{6}^{3}+2C_{6}^{4}+C_{6}^{5}+C_{6}^{6}$; ② $C_{6}^{2}$; ③ $2^{6}-7$; ④ $A_{6}^{2}$. Among these, the correct result(s) is/are.

Present the answer in LaTex format: \boxed{Your answer}
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