
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
Artificial intelligence is a technological science used to simulate and extend human intelligence. It is considered one of the most important cutting-edge technologies of the 21st century. Its theories and technologies are increasingly mature, and its application areas are constantly expanding. A basic principle behind artificial intelligence is to first determine the prior probability, then calculate the posterior probability, allowing the prior probability to be corrected and verified, and then make inferences and decisions based on the posterior probability. Based on this basic principle, we can design the following experimental model: There are two identical bags, bag A and bag B, each containing balls of the same shape and size. Bag A contains 9 red balls and 1 white ball, while bag B contains 2 red balls and 8 white balls. A bag is chosen from these two bags with equal probability, and then a ball is drawn from that bag with equal probability, which is considered one trial. The trials continue until a red ball is drawn. It is assumed that the probability of choosing bag A or bag B in the first trial is both $\frac{1}{2}$ (prior probability).  
$(1)$ Find the probability of the trial ending after the first draw.  
$(2)$ Given that a white ball is drawn in the first trial, we adjust the probability (prior probability) of choosing bag A or bag B.  
① Find the probability of choosing bag A.  
② After putting the white ball back into the original bag, two scenarios are considered for the second trial: Scenario one, drawing a ball from the original bag; Scenario two, drawing a ball from the other bag. By calculation, determine which scenario has a higher probability of ending the second trial.

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