
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 furniture store received a shipment of office chairs. The chairs were identical in every way except for their colors: 15 chairs were black and 18 were brown. The chairs were popular and sold out randomly. At some point, a customer noticed on the store's website that only two chairs remained for sale. What is the probability that these two chairs are of the same color?

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