
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
Armchairs. (From 7th grade, 1 point) A furniture store has received a batch of office chairs. The chairs are identical except for their colors: 15 chairs are black and 18 are brown. The chairs were in demand and were sold in a random order. At some point, a customer on the store's website found that there were only two chairs left 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