
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 laboratory has flasks of two different sizes (volume $V$ and volume $V/3$) with a total of 100 flasks, with at least 2 flasks of each size. A technician randomly selects two flasks in sequence, filling the first one with a 70% salt solution and the second with a 40% salt solution. The contents of these two flasks are then mixed in one dish, and the percentage of salt in the mixture is determined. What is the minimum number of large flasks $N$ needed to ensure that the event "the percentage of salt in the dish is between 50% and 60% inclusive" occurs less frequently than the event "when two fair coins are flipped, one shows heads and the other shows tails (in any order)"? Justify your answer.

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