
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 bag contains 1 white ball of the same size and 3 black balls numbered. Two balls are drawn from the bag.

   (1) How many different outcomes (basic events) are there in total?

   (2) How many different outcomes are there when drawing 2 black balls?

   (3) What is the probability of drawing 2 black balls?

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