
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
In order to investigate the number of a certain species of wildlife in a wildlife reserve, investigators caught 1200 of these animals one day, marked them, and then released them. After a week, they caught 1000 of these animals again, among which 100 had been marked. Estimate the total number of this species in the reserve using the method of probability.

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