
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
Ten balls, each numbered consecutively from 11 to 20, are placed in a hat. Each ball is equally likely to be chosen. If one ball is selected at random, what is the probability that the number on the ball is prime?

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