
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
Given that there are $2$ red balls and $2$ blue balls in an opaque bag, calculate the probability that at least one ball is blue when two balls are simultaneously drawn from the bag.

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