
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
We have a portable radio that operates with two AA batteries. In the drawer, there are 8 AA batteries, out of which 4 are drained. The good and bad batteries are mixed together. There is no other way to test the batteries except by placing two of them in the device. If the radio works, both batteries are good; if it does not work, at least one of them is bad. What is the minimum number of trials needed to ensure the radio will operate?

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