
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 person has 4 keys, of which 2 can open a door. If a key is randomly selected to try to open the door, and the key that cannot open the door is discarded, calculate the probability of opening the door on the second try.

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