
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]


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To understand the physical development of middle school students in a certain region, a stratified sampling method was planned to select 6 classes for survey from three middle schools A, B, and C. It is known that there are 12, 6, and 18 classes in schools A, B, and C, respectively.
(Ⅰ) Calculate the number of classes to be sampled from each of the three schools A, B, and C;
(Ⅱ) If 2 of the 6 sampled classes are randomly selected for a comparison of the survey results, calculate the probability that at least one of the classes comes from school A.

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