
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
An office furniture store received a shipment of office chairs. The chairs were identical except for the color: 15 chairs were black and 18 chairs were brown. The chairs were in high demand and were being sold in a random order. At a certain point, a customer noticed on the store's website that only two chairs were left for sale. What is the probability that these two remaining chairs are of the same color?

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