
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
Among 120 parts, there are 24 first-grade parts, 36 second-grade parts, and 60 third-grade parts. If a systematic sampling method is used to draw a sample of size 20, then the probability of a third-grade part being selected is \_\_\_\_\_\_.

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