
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
There are \(a\) white balls and \(b\) black balls in an urn. What is the probability that when two balls are drawn, one is white and the other is black? (The drawn ball is not returned to the urn).

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